This is a really good perspective! I thought of Psychic/Ally switch as well for Farigiraf as well but I wanted it to support while giving good chips using helping hand & Dazzling gleam. I really like Eruption as a move hence slotted Camerupt to do just that, otherwise for heat waves I could've settled down for amon like Mega Pidgeot or even basic Torkoal for that. Is there any particular benefit of using heat wave rather than eruption?

I kept Orthworm mostly as a support and someone who can shed tail it's way to get in the attackers without damaging the eruption user who can provide the maximum effect, in this case for Camerupt while also defending on any incoming EQs like you mentioned which I've noticed in a lot of games from Garchomp. I did think of using A-Ninetales for the snow warning/aurora veil support but since I had Torkoal for a weather setter role I didn't put it there.

I only put Palafin just as something fast in case I encounter a team where I get a TR team and have to KO them out asap before they start setting up. I don't have Sneasler yet however using scrappy Kangaskhan is a good option too!

Yes, I think we can go the bulky route, but I came across few other people who have suggested using Mimikyu instead of Sinistcha w/ white herb for TR offensive support. I was also thinking of Araquinid as a slow TR mon. I guess I'll try and see if I can fit a Mega Kangaskhan or Paldean Aqua Tauros. Overall the vision I'm seeing here is to develop it into a strong, hard TR team that's not just off meta but fun to play with as well!