Thanks for all the suggestions.
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As an aside, I'm experimenting with making some carry-on luggage that attaches to a backplate to form a backpack for ease of carry. The cam bands and crotch strap are removed from the backplate and stored inside, the shoulder/waist strap remains in place. With everything except fins but including a wetsuit, it is going to be under the carry-on size limits, and I'm going to put lash points on the back so I can carry the fins as well when I arrive. I'll post pics when it's done.
Here's one example: Backplate and Pack | Deep-Sea Sherpa
Thanks for all the suggestions.
Regs and computers go in my "personal item" (i.e. a regular old backpack), which I carry on and stow under the seat in front of me (if there's not room in the overhead). The only scuba gear I put in a checked bag is fins and miscellaneous stuff like cutting devices.
I'm experimenting with making some carry-on luggage that attaches to a backplate to form a backpack for ease of carry.