You need to have a button that triggers(in logic) a blueprint code called “Run console command”
The console command would be a string containing "r.AntiAliasingMethod " (Notice the space included) then concatenate with string holding 0-4 (Skip 3 if in deferred).
EDIT: Thank you for thinking about this.
Members (including myself) at r/f*ckTAA would be grateful to hear this from a dev.