I don't think blaziken needs to be removed from the tier, but I feel like u-turn on it makes it incredibly frustrating to play against. I'd rather U-turn be removed from its set with that I think even as a revenge killer it won't be as central to the meta would love to hear others' thoughts on this though.
Hi there! If you want a signature there are plenty of Signature Shops in the creative media section of the forums: https://forums.pokemmo.eu/index.php?/forum/32-creative-media/
If you still don't find a signature shop that you like, I recommend requesting in trade corner instead of here, thanks!