Sorry it has taken awhile for me to reply. I travel a lot in SE Asia as well, so I 'get it' about the weight restrictions. Yes, with lighter gear I may have to add more weight to my BC or weight belt.....but I won't have to carry it through airports or pay baggage overweight fees for it.
With the Delta 3 Ti I usually use a SeaQuest Air Source (integrated reg/inflator). That saves a hose, breathes fine and is a great inflator. If I am teaching I add a lightweight octo, usually Oceanic or ScubaPro. I have a SeaQuest Passport travel BC that comes in at a bit over 5 lbs. with weight pockets and all. I found a mini SPG made by Promate that is calibrated in both PSI and BARs, which is very handy when diving in Asia. It is on a hose by itself. No depth guage. I use an Oceanic Versa Pro wrist computer for my depth. Tusa Expert Zoom fullfoot fins are very light, but still have good thrust. .5 mil Xcel tropical wetsuit.
I have attempted to beat the weight of my Passport BC with a DR Transpac, and also with a DSS Kydex backplate, hog harness and DR travel wing, but by the time I add small weight pockets and tank straps, it is as heavy or a bit heavier than the Passport. That surprised me. I had expected the BP/W setup to be lighter than the Passport, but it wasn't. I may still get a DSS Tropical Travel Wing 17, which is a very compact lightweight wing. That will be some lighter than the DR Travel Wing. Even if it ends up being the same weight as the SeaQuest Passport, I think it will dive better. I like the modularity of a BP/W, but the little Passport is a great travel rig, and trims out well for me. Oceanic makes the Islander, which is a rear inflate travel BC. I like the looks of it a lot, bit it was not out yet when I bought the Passport.
Most of the regs I would want to use are $300 or more, so with the Delta 3 Ti, paying $100 more to save 2 lbs or so is worthwhile for me. It saves that 2 lbs every trip I take! I don't give a wet slap what anyone else thinks about Titanium regs.
I can give you accurate weights for most of this stuff if you want that much detail.
Safe diving,
Thomjinx