My husband/buddy and I are similar to the OP and his wife in many respects, including number of dives, type of diving, body size, etc.
In terms of dive travel, we prefer light bcds, not only because you have to carry them onto the plane, but also because you may have to carry them back and forth to the dive boat every day, if your dive op doesn’t offer valet service where they wash and dry your gear. For true travel bcds, I would recommend those listed above by
@diversteve and I would also add the Oceanic Biolite, which we own. It comes in male and female versions and your wife might prefer that. And they do include trim weights. These all weigh around the 5 lbs range.
More on the technical side, we also bought Transpac XTs with 25lbs travel wings. We intended to use these on liveaboards and we do like it for that purpose but we have one reservation about it. So we are giving it another go in December and if that problem remains unresolved, we might sell it. Our Transpac rig weighs about 7 lbs.
I personally think the Hydros Pro is heavier than I like for travelling. I believe it is closer to 9-10 lbs. and due to its material, it does not pack as flat as my other 2 rigs. I don’t doubt it’s comfortable and steady though, but then so are my 2 other rigs.
I also would like to try the xDeep Ghost, which is light and back inflate. I think it would be great for travel.
I personally don’t prefer bp/w for strictly warm water vacation diving. It really isn’t a “pick up and go” kind of rig. Lots of fiddling with it to get it right. Plus, the benefits aren’t that great for warm water vacation diving as compared to non-bp/w’s. I’m just not that kind of diver when I’m on vacation.
I have nothing against bp/w’s. In fact, I will be doing some pool work in one soon, but I just don’t think it’s the right tool for the job (i.e., warm water vacation diving).