God no.
I don't see the connection. Vulcan emotional suppression is an acquired skill (one that comes with great sacrifice, too), not a biological distinctiveness.
There's speculation amongst some fans that T'Pol's dad was a Romulan -- I think it came from her mother's dying words (I don't recall exactly what she said, but I think it was something about there being a reason T'Pol always had more difficulty suppressing her emotions than most Vulcans).
For T'Pol's father I would pick someone like Mark Alaimo.
Every Star Trek series without James Sloyan is destined to be cancelled.James Sloyan...he was required to appear on Enterprise at some point, and that he didn't is probably why the series ended prematurely.
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