CVF
It's a golden rule in aircraft development ( and various other bits of kit for that matter ) that one does one thing at a time, i.e. new engine, new airframe but not both at the same time unless at war.
The F-35B ( or any other mark ) will take some serious testing from the CVF/s ; I'm not into gambling, but would happily put a whole £ in ( I AM half Scotish ) that the first fixed wing thing to touch the deck will be a Harrier.
I'll say it again, as the F-35B ( and the A & C models which they all they entail ), have a LOT of devopment work to do yet, a couple of dozen Harrier 2+ ( at the moment standing in the Mohave desert ) with AIM120 AMRAAMS could at the least provide fleet defence for ourseves & allies, and shares a great degree of ' commonality ' of parts with the Harrier GR7/9 strike / bomber, ( but unlike the Sea Harrier the media remembers, NO fighter ) - I think I'm in a position to know as I worked on both.