Does this idea work at all to begin with?
It works and the build linked above should work fine for you. That said, TM also synergizes very well with guns, and gets you access to Stasis and Psycho-temporal Contraction, which are both really strong abilities. The advantage of going TM over TC is that you only need 70 TM, since these abilities don't scale with TM, and you can leave will at 3 as well. You also wouldn't want to pick up psi feats other than Premeditation. So going the TM route instead of the TC route leaves you a lot more skills, feats, and ability points to dedicate to guns, stealth, or whatever else.