Russian Layout backlight compatable PBT keycaps?

[Therac-25]

Is there any vendor that does custom keycaps in other languages that are backlight compatible?

I've found a couple of PBT keycaps, but not for back-lights.  The only Russian backlight compatible ones I can find are the one cheap ABS Chinese one that's spammed all over amazon and ebay which look like trash.

I'm just wondering if this is a solved problem and there's a vendor who does this kind of thing that isn't trash.

[Fusion-Reactor]

I've been trying to find such keycaps too, but have not found anything decent yet.  I've been learning Russian and my Russian teacher told me just to remember locations of all Russian letters on keyboard, and it works fine for me so I don't need a set of Russian keycaps.