The KC-46 will not have a 787 cockpit, but it will have the 787's 15.1" large display system (LDS). You will get a type rating on the 767 then take KC-46 differences training so I don't think you'l receive a 787 type rating for that.
Anyway, my guess (and hope) for FTU and MOB1 & MOB2 are McConnell, McConnell or Fairchild, and McGuire, Rickenbacker or Pittsburgh. Being a reservist commuting to a base is a big consideration, which leaves Altus and Grand Forks out the door!