I love the 64 Up B but as a boost to recovery I suggested giving him tether out of Up B ala bbrawl Link.Is TL's recovery being like Link64's a permanent idea or no? I'm all for the kill move but yeah.
Some other Tink ideas:
A shield bash ftilt? could be super quick with low damage and little knockback to set up for an fsmash.
Rolling parry attack as a dash attack? press A in a dash to roll (this would probably have some armor on it), you can roll past the opponent and press A again to do a quick backward bair-like slash behind them.
Spirit Tracks whip as tether? This could be used to give Tink a really powerful and quick zair.
I already mentioned helm splitter as a nair. Looks kind of like MKs nair (although not so fast and choppy) most of the hitbox around it works like Pichu's nair but a hitbox under it sends the opponent down and gives Tink a diagonal boost forward allowing him hop away and put some space between him and the opponent.