Cost and time issues would seem to be somewhat critical, if Trust-me-Tone's eagerness to involve British forces in dangerous situations without the right kit continues on its current track..
Which means, realistically, sticking with one or other type of F-35 (sorry, but 'Dave' is too spotterish) depending upon whether the RN's new carriers will be big enough to support the -C or will be limited to the -B with its complex STOVL system.
Could 't Bungling Baron really develop a carrier capable Typhoon within the same timescale as the F-35B? Would it really fit the new carriers?