Most, if not all, tournaments will gladly accept conversions especially if they are well done. I've never had any problems, but if you're unsure you can always ask the organizer before the tournament starts.
As gutbusters, we kind of rely on conversions anyway, because we have no official model for some profiles. Gutgorger Tyrant obviously, but none of the Tyrant models has a pistol. It usually suprises opponents when I say that they can shoot.🤔