Tyler is Voq would be pretty silly, given that TOS already established that Klingons can't fake simple medical screens and (even more) the ridiculousness of a religious fanatic Klingon being able to seamlessly imitate a dashing human rake, knows how to flirt with any female within eyeshot. (Come to think of it, men too.)
I mean, come on. If you're going to write that angle, at least have the guy be mentally damaged (easy enough, the Klingons supposedly had him for 7 months), so that his behavior is a bit odd by normal human standards. As with either Lorca or Burnham. Now *they* could credibly be Klingon plants.
I think the writers have been misdirecting the fans with their various little "tip offs." At least I hope so. If Tyler is Vog it not only would be a "OK it's about time for the reveal" moment when that finally happened, but as I wrote above, stretching credibility even for a show that exists to stretch credibility.