If the VC10K is dismantled and transferred to the US for reassembly, it could perhaps fly again. But as for flying in UK airspace - zero chance.
Then there is the slight problem of F-35B/C compatibility clearance trials.
As for setting up the centreline HDU - good luck with that!
Some ex-airline A330s given a 'light' AAR modification programme in the same manner that the A310MRTT was converted would surely be a better plan?