The tank top stickers on my USA bike were not top coated. I peeled them off with my thumbnail and took off the little bit of residue with bug and tar remover. With a dab of wax you can't tell they were ever there. This was done at about 250 miles so the surrounding paint had not had much chance to fade.
I peeled mine with nails and then rubbed out with microfiber towel + 99% isopropil alcohol. All took me about 15 minutes of work, i would not say that the glue residual came out very easy, but still did not take much time.
Peel the stickers off, dip a cloth into your tank, lightly rub the gasoline over your the glued residue, it should mostly come out, then use a cleaner to remove the gasoline before it can harm the paint, and throw a coat of wax on it, youll be good to go in about 5 minutes.