Try clubs on leaderboards? If they accept you. These days PPOTD has fallen out of common use in many clubs(which sucks).
Because of the difficulties of ppotd not many clubs do them strictly despite how many high stat users there are on here. They prefer cats :? Your best bet would be leaderboards, as most clubs that do any ppotd only do the occasional one or so
One that comes to mind is 'jejune stars'. I would suggest taking a look at the POTD thread and watching what other clubs do Pro testing. I know sometimes my club 'xero' does Pro parties when we can, usually when something like Counter Culture Pro or FA101 Pro are PPOTD. Also, next time your best bet is to browse or post this question in the club banner thread instead of making an entirely new thread.
We have been b2b ppotd club for 5 years now, mostly packed with pro parties loving players, testing more than one pro daily and dropping inactives to keep the parties flow. Refer to our club wall and history.??
Rogue empire will do them once in a while. Or they did like a year ago, haven't been there in a while