found some good art and a good reason to implement it
I doubt it is possible to "find" an art of that kind. Not because it is not exist (it is actually, just rare), but because a general SS problem - low resolution. Any "good" art would be in high resolution and simple shrinking(external or in-game) of a flat-based curve texture would give either artifacts or bloor. To work as intended it suppose to be created/heavily adjusted in precise resolution and curve or close to it. Is it possible? Pretty sure it is, but not sure how hard + simple kitbashing won't work, a lot of painting would be required. And the more thick donut is, the more visual problem will be caused by curving it. The only way to entirely (or almost) remove those issues, not making texture too thin - is increasing amount of textures in a circle (from 6 to like 8-12) with respective decreasing of texture height. Not sure if it is possible, and even if is, 12-syde symmetrical thing is really uncool looking or even drops into boring almost monoshape circle.
And as for "reason", the only one currently is theoretical "coolness". And as it is lore-heresy, probably not default option. For the feature 95% of users would never ever know, it requires unreasonable amount of efforts, while result is not guaranteed. That is a personal opinion, but I believe it is currently far beyond symbolical "forget it" line, and will remain there until there would be something better, than simple "coolness".
However, I am glad one more "impossible" flag is removed.