Okay, I'll just toss a few thoughts out there for you to consider in case anything lands. For reference, I am not a BPW diver and can't speak to that, and my primary brand, that I am most familiar with, is Aqualung/Apeks.
Fins - I don't have any genius suggestions there, except depending on size you wear, you may not need something designed for carryon. I just measured some Aqualung "ladies" fins, and some Cressi and some Mares in size S or XS, and they tend to be no longer than about 24"-25" in the smaller sizes.
BCDs - Aqualung makes the Zuma travel BCD, weighs less than 5 pounds, and is weight integrated & back inflate. So pluses are compact size and weight, possible negatives are: less durable materials than heavier BCDs, no adjustability of cylinder higher or lower in tank band, and any trim weights added to band will NOT be higher on the cylinder than your integrated pockets, so no shifting of the center of gravity.
They also make the Outlaw and the Rogue, which are not as light weight but may suit you. Sounds like you could be a candidate for the stripped down Outlaw, with optional weight pockets. Also, the Rogue waist assemblies are interchangeable with the Outlaw, so you can mix/match the parts you want. Let me know if you need more details there, I don't want to write a novel here and now. The Rogue is now my travel BCD.
Regulators - I don't know the Deep 6 regs, but I would be surprised if you gain more than a pound or two by going to a "light weight" regulator, and maybe only ounces to gain? The Apeks Flight claims it is the lightest regulator available. It is a nice unit, (my travel regulator) but does require special tools (I think five!!) for service. The Apeks XL4 is a cold water "kind of light weight" regulator, with 2nd stage almost identical to the Flight. So it could be a switch hitter for travel and local. There is not much weight difference between the Aqualung Mikron and the Core, so the performance difference and the rubber versus Miflex hose are I think more relevant considerations than a few ounces. Again, I don't know that you gain anything significant versus the regulator you already have. Unless you are looking for a reason to buy yourself more toys...