One thing b4nny is right about though is the invite players can get invite pugs going. Issue is nobody wants to take the lead. See who's added up in advance, tell them to add to invite instead so you can ditch the Advanced players you don't want to be stuck with, see who's grinding a DM server, PM them on steam to add up
I've lead in house pug groups before. I know it's not fun to be the one who has to organize 12 players, but if there's like 5 people added in advanced that have access to Invite div you basically have half the work done for you already.
PM some friends, write in the text channel for Invite Div in discord, write in the text channel for advanced on faceit that you're trying to get invite pugs going so people who might look for advanced pugs in the next few minutes will go to Invite Div instead. If others try to Pm some friends they know pug frequently you'll get 12 in no time
If you want to revive pugchamp for invite pugs you'd have to do exact same thing except you'd only be able to PM through steam or spam invite player twitch chats. At least faceit also gives you some options to reach out to people through discord/faceit site