@Peanits Regarding the "can't change the killer" requirement. I think many people do stuff while waiting for a match like spending bloodpoints or preparing other killers with builds for the next daily or something like this.
I guess it would not be an easy thing to change, but just in case: would it be possible to lock the character that you are searching the match for in the background? So just select Demogorgon, search for match and you get a match for Demogorgon, no matter which killer you currently have selected?
Also, will we get any details on how the rating is working? Would be very interesting to know how skill is measured, if there is just a win/loss condition and how this is determined.