Here's the thing about Bonaire.
If you boat dive it could be real easy on your back. The dive resorts are optimized for that to a degree. And offer packages of daily boat dives both mornings and afternoons.
But the best of Bonaire is the shore diving. Most of which requires entry over ironshore, ironshore in the water, and often loose coral rubble in the surf line. The standard practice there is to gear up and with a buddy stumble thru it (in my case) until you reach deeper water and can put on your fins. The other consideration is that many divers don't boat dive at all - instead taking advantage of their bundled truck rental/unlimited shore diving package.
Scuba Shore Diving Region: ABC Islands shows actual entry photos of many of the sites. The brown stuff seen just offshore at many - that's the ironshore, it's often shallow and slippery. There's very few "clean" entry points on Bonaire where you can walk out in the sand. So can you do that with your back?
I was asked at 3 different locations if I needed a buddy while waiting for mine - or rinsing gear. We also made tentative arrangements with a couple people we met at the departure gate while waiting for the last connection. (wear a dive shirt...) And two other groups on our boat - we saw them several times leaving a site as we were getting there in the afternoon. The standard vehicle included in your dive package is a small 4 door truck so most people can find room for one more if asked. You might also check with some of the Bonaire "regulars" and see what they're doing. herman here runs a trip down there fairly often from the NC area - as do several others. Usually they post it in the Bonaire forum if they're looking to add people.
Buddy Dive is a popular option - in addition it would be almost unheard of that you wouldn't be able to find a buddy there - just ask anyone at the bar/pool/etc. really...Gear storage at Buddy Dive is on the dock near the boats. They also have a drive-thru tank pickup for shore diving - they will load them for you. It's a little bit of a carry between your room and the dive dock though with your stuff.
The other issue with that is that some sites are a long carry, 1000 Steps for example has 64 stone steps down. Karpata has both steps and a fairly difficult entry point along an old pier. The "Leap" sites are usually accessed via a path over the ironshore and then you leap off the cliff - there's a ladder for exiting. So not the best idea for you.
The south side sites are somewhat better. At many you can park 20' from the waterline. However there's more ironshore at many of those sites that you'd need to navigate. Most people gear up sitting on the back of the dive truck instead of carrying their gear. I suppose you could also drag it to the waterline then float it out but that's not as easy as it sounds as at many sites the ironshore is a few inches underwater and there's also a lot of sea urchins. Most people wear good treaded boots for that reason.
Capt. Don's Habitat is similar - the dive lockers are just off the dive dock. For shore diving there they also have a nice wide set of (slippery) steps. The Divi Flamingo in town could be another option also - their dive lockers are on their dock. The Plaza Resort south of town (larger property) has their dive lockers about 50' from their boat dock. Their shore dive is off a sandy beach but it's about a 5 minute walk between them. They stage tanks there also. Plaza is convenient for shore diving also as you can temporarily park near the dive lockers to get your gear. Den Laman Condos is another option - it's pretty compressed, gear storage is close to the dock and you can also park by the dive shop to load tanks for shore dives. They have an excellent set of stairs leading to an excellent shore dive. It's a more upscale property and even has studio condos but finding a buddy there might be a little more difficult as it's a smaller property. Sand Dollar Condos next door is a larger one though and the Sand Dollar shore entry is right next to Den Laman's dock.
Except for the Plaza since they market it as a vacation destination with diving, I don't think you'd have too much problem finding a buddy. People post their dates on-island both in our Bonaire forum here and also on bonairetalk.com so possibly you could arrange a buddy before you go. Most people on the Friday night red-eye from Houston are probably divers also - who else would be that stupid...lol.
One thing we've done on Bonaire is "dive the resorts". Most are on named dive sites and basically all of them have dive docks or easy shore entries. North of town they're back to back in one area so a short drive between them. Most usually have a gear drop with parking lots farther away.
Looked at flights yet? Besides direct to Bonaire look at flying into Curacao - or even Aruba - then taking one of the local carriers over.
http://www.infobonaire.com/airlineinfo.html Or as I mentioned if you can get to Houston b4 midnight on Friday night, the red-eye gets you there around 6AM. The resorts are set up for it, either they'll have your room ready or will store your luggage while you eat breakfast. Everybody goes thru a BMP marine park orientation/buoyancy check dive - those usually are around 9AM so you can be diving by 10:30 or so.
