It will be easier to find an alliance that hunts 9-10* and with you 5 to take it to next level 10-11* than finding 15-20 people with your requirements that wanna waste probably at least 1 month of possible good 4* am.
the only main downside is that you wont call the shots aka you wont be the leader,.
You may also wish to cross pollinate by looking in the game’s AR and 20+ rooms, or in Line; there are at least three rooms dedicated to helping folks find good homes. Let me know if you need an invite. Just tag me: @Rook.