Others can probably explain the limitations on different UYs better than I can since I don't have any direct experience, but my understanding is that contracts with different UYs are in separate
DVC accounts and the only way to combine them at the 7-month mark is transfer from one account to the other (which can only be done once per year).
But, wanted to note that in this example, those GFV resale points could never be used at RIV (or CFW, VDH, or future resorts) so it wouldn't matter unless you were trying to combine the GVF and RIV points at the 7-month mark for a resort other than those restricted resorts.