Yes. You can only get a 4th or more FP+ at a kiosk, but once you have it, you can edit it on the
MDE app. I prefer the website on Safari over the app.
There have been reports of people trying to get Test Track as a 4th FP+ at a kiosk, and they were all gone for the day. They would then make a FP+ for Living with the Land for later in the day. Then they would keep trying to change that FP+, and occasionally they were able to get someone's cancelled Test Track FP+. Note-(You can only change a tier 1 FP+ to another tier 1 FP+, and same for tier 2. This strategy will likely only work for very small groups, and you might be checking your phone a lot and not get the FP+ you want.) Probably more information than you needed, but this is an example of someone editing their 4th FP+ on the MDE app.