As for basing, Marham is likely the only option given the eye watering amounts needing to be invested down there
Assuming 2 Sqns afloat that may only be 5 Sqns of aircraft to shoehorn in - but the families won't be going anywhere. Has MR the married quarters for 7 Sqns worth of air and ground crew?
p.s. As an ex-FC the airspace for ACT/PIs of East Anglia was congested 20 years ago, even after WT shut as an AD base. Fitting in even secondary role AD for the MR on top of CY will be lots of fun. Especially if the USAF decide to replace the F15Cs with F-22.....