New Ability: Tinker's Touch (aka I want to make Tinkaton OU)

Tinker's Touch
The user's Steel Type moves are Super Effective against opposing Steel Type Pokémon.
calcs, done by changing Steel to Rock on targets:
Swords Dance:
+2 252 Atk Tinkaton Gigaton Hammer vs. 248 HP / 252+ Def Corviknight: 506-596 (126.8 - 149.3%) -- guaranteed OHKO
+2 252 Atk Tinkaton Gigaton Hammer vs. 252 HP / 252+ Def Gholdengo: 542-638 (143.3 - 168.7%) -- guaranteed OHKO
+2 252 Atk Tinkaton Gigaton Hammer vs. 252 HP / 252+ Def Orthworm: 402-474 (116.8 - 137.7%) -- guaranteed OHKO
No Swords Dance:
252 Atk Tinkaton Gigaton Hammer vs. 0 HP / 0 Def Iron Treads: 312-368 (97.1 - 114.6%) -- 81.3% chance to OHKO
252 Atk Tinkaton Gigaton Hammer vs. 112 HP / 0 Def Kingambit: 312-368 (84.5 - 99.7%) -- 81.3% chance to OHKO after Stealth Rock
Its matchups against the OU Steels have improved, though it needs a dance to OHKO the defensive ones.
Would this be enough to make it OU by usage, or is this niche? And would this be too good for UU?
I'm not entirely sure about either of these, but I'm not very good or experienced, which is why I'm asking.