If alternate profiles are created in MDX for each member attending a party, the party tickets can be purchased (or if already purchased, they could be reassigned) to those alternate profiles. You’d want to use different names than those of your real profiles to avoid any chance of a helpful Castmember accidentally merging these various profiles.
The issue then becomes having a MB for those alternate profiles to enter the park with as well as tap in to the FP touchpoints. If someone wanted to go this route they would choose to have the tickets (plastic cards) mailed to them when completing the checkout process on the DW website. These tickets (plastic cards) would then be used to enter the party as well as tap in to all FPs booked to those alternate profiles.
I’ve used this method two years in a row for
MVMCP and it worked like a charm. No problems booking FP with party tickets and no cancelled FPs. Booked 3 FP each on our real profiles for the park we visited that morning then, booked 3 FP in MK for the party (4pm, 5pm, and 6pm IIRC).