I dont know what kind of material electrical tape is made of (is it rubber?) but I'd use it if it cant scratch the plastic screen on the Switch.Has no one really thought about adding black thin electrical tape to the 4 sides that cause the scratches?
Just cut out 4 long lines and 4 short lines. The 4 long lines go on the top four l l lines, and the small ones go under the rubber nubs.
This keeps my switch scratch free.
Quick Edit:
if you don't care about the back, you only need two pieces!
I wonder to those that are sending in their dock and left joy-con, are they sending back revised versions of the parts or the exact same ones but pulled from a different box?