An Aqualung Zuma is a minimalist travel BC - 4.75lbs. dry weight. It has weight integration but only one pocket on the right side waist strap.
Zuma About $300 at leisurepro.com - over $400 from an authorized dealer if you want an AL warranty. It even comes in it's own drawstring bag for travel.
What's a really good deal now is a Scubapro Litehawk - they're $239 currently. Probably more lift than you need but the wing is very low profile. Integrated weight pockets which I guess could double as pockets if you added a belt. It looks like there would be room to clip a 3rd-party add-on pocket to the waist strap also but I've never seen one in person. Slightly heavier but pretty compact for travel.
Scubapro Litehawk BC, Black at LeisurePro
The ScubaPro GO is their jacket-style Travel BC. I don't know much about it since that's not my preferred style. Weight integrated also and it comes with a carrying bag as well. And what look like two huge pockets. A little heavier at 6lbs. and how they get the weight down is by using a ligher weight material - 220 Denier nylon vs. 1000 for some of the others.
Scubapro GO BC at LeisurePro $479 at LP who is a ScubaPro dealer so probably the same price from yours. Or Casey^.
My last suggestion is one of the travel models made by Zeagle. The advantage they have is Zeagle sells several pocket systems that integrate with it. You can even add their Ziptouch or Ripcord integrated weight systems and still have room to add one or more pockets - they clip on in different places. Both are back-inflate models also.
One is the Express Tech - a modular soft-backplate model that theoretically can even take doubles - it has the capability to add their doubles kit and change to a larger wing. It can
maybe still be bought in a very minimalist configuration as the Express from some dealers - the Deluxe currently being sold adds a few comfort things like harness padding. $349 plus add-ons. Zeagle pockets aren't cheap either.
I keep thinking I'll buy one for travel and probably eventually will. I use their Ranger currently.
Zeagle Express Tech Deluxe BCD at LeisurePro
Their new travel BC is the Covert - it's designed to roll up like a newspaper. They advertise it's not much bigger when you do. I'm not positive what pocket systems are available for it but I believe there is at least one option - a dealer would know. It's about the lightest travel BC I've seen at 3.9 lbs. Seems to come with the Zip-Touch weight system in this ad for $429. Pretty new model just released this year IIRC.
Zeagle Covert BCD at LeisurePro Some of the Zeagle line are not as modular - for ex. this one doesn't use their PFS (Personal Fit System) to lower the price. Ounces count so they use Delrin d-rings instead of steel also.
Pocket options for the Zeagle line:
Accessories I don't see why some of them couldn't be used with other BC's as well. Dive Gear Express also sell clip-on pocket options that could be used with any of these^.
https://www.divegearexpress.com/bcs/pockets.shtml
I see Cressi Travelights mentioned also in this area. That's all I know of them.