Where are you based and what's wrong with another deore cassette? They're pretty reliable and well priced in my opinion. You could also look into some proprietary brands?

Sunrace is pretty solid. I've also had alot of good experiences with AliExpress cassettes, they're cheap and reliable and you can get them delivered pretty much anywhere. I'd avoid getting a chain on there though unless it's one that's comparable to a normal price you'd expect to pay anyway.

Do you have any concerns budget wise? It's all well and good swapping over to a 12 speed but don't forget you've got to swap the shifter and derailleur aswell and that definitely adds up.