Have tried on TG1860.
They will come off. But maybe not in one piece.
They been on there a while, they're going to be stuck good, and brittle. You can loosen the stuck but you can't fix the brittleness in my experience.
Years ago when the TG1860's were "new" (2002-ish??) we got one in a crate that was damaged, so we (I) ordered a hood. Big deal, just warranty it. Got the hood, and no decals. Great, it's still new so I'll just use the secretary's hair dryer and peel the stickers off. Yep they came right off but the glue stuck to the hood, and not to the decal. Trying to get new glue on the sticker to make it look new so that it could be put on the showroom? LOL...ain't happening.
If you want it to look decent, and it sounds like you do, see if you can find a dealer that has them.. May not be available anymore for your mower but a lot of times dealers will have aged inventory. Finding them is challenging but rewarding. When I was doing dealer work I tried to remember some of the aged inventory for this very reason; the boss would tell us to chunk some of it (decals and gaskets especially), but I always stuffed them into a folder or in a corner somewhere and kept a mental "inventory", in case someone needed them-and often they did. Kawasaki has a want-ad section on their dealer-only web system so that dealers can post NLA parts for sale or wanted. it is VERY handy!!! I wish a lot of manufacturers did that. Vintage motorcycle repair and restoration is a thing.