The short answer is no. Parking at a resort for an ADR is just that, parking for an ADR. The resort lots are not for theme park access, they simply aren’t big enough to handle everyone who might do this plus give parking to the resorts own guests.
Just as you would expect to find parking at AOA when you return so do the people who are staying at WL when they return. Paying at your home resort applies only to your home resort and gives no special privileges at another resort. So you can park for your ADR and then need to move the car afterwards.
Your best tactic may be to park at the TTC, take ferry or monorail to MK, then the WL resort launch for your ADR. Then reverse the steps to go to the party and return home.