Thumbnail angles for single right earrings [SOLVED]

Hello, this is my very first post in this forum, but I worked with S4S before for texture editing/recolouring only. But after my discouraging first failed Blender experiences I'm at it again haha.
The closest I found to my problem was this thread about Thumbnail Angles. Here menaceman44 pointed out it wouldn't work on Maxis stuff. So yes, I didn't try it yet because it also sounds confusing...  I tried to follow that explanation but failed as it seems there is no modelID/thumbnail ressources for this kind of item.

I thought I try to start with easier projects this time and want to correct some Maxis earrings. They often sit too high on the ear for my taste and/or they are single right earrings and this issue is about them.

The thumbnails for the earrings after the mesh editing show the wrong ear, the left one, like for paired earrings instead of the right ear like for the original Maxis version. I wonder if Maxis did some tricks for the single earrings while the left side is default. I could 'simply' make custom thumbnails for them but why not learn how to tilt the thumbnail angle instead? I imagine that somewhere someone already did what I try to do and the solution to this could be already well-known.