Ditto except I have disc lock key as my 2nd key.It is for that reason that I usually have only one key, which is in the ignition, plus a soft fabric or rubber fob, so no scratching. Two of my bikes have a separate ignition and fuel tank key (old bikes, replaced caps) and what I do there is cut a length of rubber fuel hose and put that over the sharp part of the fuel cap key so that when the ignition key is in, the fuel cap key can't scratch anything.
If you go with that strategy, there is no need for any protection whatsoever!
I like this idea. I will look into it. I only have single house key and a work desk lock key and a Tile on mine, but it's enough to cause an annoyanceI used 3M paintwork protection film on the tank above the seat and now I see surface marks appearing on the tank by the ignition. It's the zip tags on my sleeves that are doing it when I turn on the ignition. Going to fit a small area of paint film there too. It's all but invisible.
Z
Yes, ignition key attached to rubber fob only. No worries...It is for that reason that I usually have only one key, which is in the ignition, plus a soft fabric or rubber fob, so no scratching.