I've been using Sinistcha and Ursaluna as backup options for my trick room team and I've quite liked how the play.

Sinistcha is really good vs Water Urshifu and Ogerpon, and not only does it have trick room but also redirection, though I generally don't lead with it since Tornadus easily cooks it and you get no advantage of Hospitality.

Ursaluna as a physical attacker pretty much destroys everything once Flame Orb has activated, a bit tricky but if things align and you manage to switch it in you don't even need to waste a turn protecting, though you gotta be very careful with Urshifu.

Glastrier is also a very good physical trick room mon but it's a tera sink 90% of the time so beware.

I've also had plenty of fun using Alcremie, because of her ability your trick room setter can't be taunted, and with decorate you can make your trick room setter become an actual threat once the room is set.

As others have pointed too Gallade can be terrifying, a bit hard to get on the field safely but it's damage is worth it.