Even then, I think its still probably better to start with Hail as the playstyle (or preferably, Abomasnow as the base Pokemon) and then incorporate Trick Room into it. Bronzong / Reuniclus / Conkeldurr fit well into Hail because of their resistances, and Trick Room is added on top of that. Starting with Hail and incorporating TR in later is generally a better idea as the team is far less likely to be Trick Room reliant.
If we start with Trick Room as the playstyle, you are much less likely to get a team like yours because the idea of Trick Room will be in everyone's heads from the offset. We'd inevitably end up with a heavily Trick Room-reliant team that crumbles when Trick Room doesn't get set-up. I have absolutely nothing against Trick Room as a whole because its generally excellent against opposing offense. One of my best teams at the moment has Trick Room Cresselia + Quiet SpecsTran at its heart, but part of the reason I find it works so well is because Trick Room was only an afterthought, and as such the rest of the team (prior to adding TR Cress) doesn't require TR support whatsoever.
I just feel that labeling your team as "Trick Room" from the get-go is setting yourself up for failure. There are next to no good "Trick Room teams" in BW2, but there are plenty that use it as a win condition without it being the focus of the team. I'd be much more confident in the team we produce if we start with a more generic playstyle choice, get a solid start with 3-4 Pokemon chosen and then think about the possibility of Trick Room or Gravity.