Using a Villains after hours ticket to make Fast Passes while waiting for regular tickets

My daughter and I are going to WDW in April with her dance group. Fast pass booking window opened today but we are still waiting for the park tickets ordered through the group. I also purchased villains after hours tickets for one evening. I used my DVC discount so I can’t move the tickets to a dummy account. MDE will let me book fast passes for the day of the after hours party. I made Fast passes for that morning at Epcot in the hopes that when our 4 day tickets from the group arrive, that can just be one of my 4 days. What do you guys think? Is my logic flawed?