You mean like the other 90% of the posts on this site that don’t include references?
F-35
cost per variant is widely known, with the lot 15-17 F-35A costing $82M compared to $109M for the F-35B, saving about $320M USD for a buy of 12… or about £240M.
Remarkably, and surely just a coincidence, this is the same
UKMOD that sawed off 2x E-7As from that project (40% of planned capability) to save £200M (12% of program cost) A desperate move that has variously been described as a folly and perverse.
Similarly, Information that shows F-35 variant unserviceability and maintenance requirements is out there for those willing to look… an example being this
fact sheet from LM showing the F-35A has an extended mean time between failure than the F-35B (10.4 hrs compared to 7.4 hrs) and similarly requires less maintenance man hours/flight hour (4.7 compared to 7.7).
There are sound, logical reasons to switch from B’s to A - that don’t entail picking up a nuclear mission. The hint is where the A models will primarily be assigned by the UK during routine training.
You’re overstating the difficulty given the common mission and aircraft systems and procedures. Yes - there will be different sparing required, but there are benefits still realised through aspects like infrastructure, aircrew and maintenance training and procedures, logistics chains, contracting solutions.
None of the issues you have flagged seem to have phased the RAF, the RSAF, the Italians or the Japanese who have all committed to a mixed fleet buy.