Tub to Shower in a condo

[FeltonPlumber]

I have a contractor who wants to turn a tub into a shower in a condo and I can't get access to the unit below to replace the p trap with a new 2" line and the floor demo must be kept to a minimal. I haven't been able to find a way to adapt onto the existing 1 1/2" copper tub waste to transition into a shower drain and have hit a dead end. Any thoughts?

 

[Twowaxhack]

You can get a shower drain that will connect to 1.5” copper, I believe.

Oatey or souix chief makes them.

I believe they make the rubber sealing ring that will fit 1.5” copper or I know for sure you can get it for 1.5” pvc or 2” pvc.