Today the Aliexpress led ring arrived (on a sunday! and after only 10 days!).
It is actually much smapper than I anticipated.
I could clearly see that there was some kind of film on top of it, so I gently tried to lift it. It came right off, and lo and behold - it's the exact solution I've been thinking of! The film is about 0.15mm thick. The white ring is 3mm.
Inside, there are holes all the way down to the PCB, with some kind of surface mount diodes. The holes have white edges but the front is black. It looks very good. If I'm able to cut similar holes I have a good chance of making this work :-D
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