So is the MCPCB 10mm? If so you must have did a good bit of filing to get the 16mm to size. Can you drill holes for the screws? Please let us know if you get it properly centered and focused.
The Nitenumen was $19.99 from gearbest on the recent flash sale, so $30.00 for a MH20GT clone isn’t bad at all, and for some even $35.00, considering the nitecore goes for $100.00.
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A of BLF member in Spain and another it the UK said they de-domed the stock LED with the gasoline trick, after unsuccessfully getting the reflector to properly focus and center with an Noctigon XPL-HI:
Posts #10 & #18 in this NE01 review thread (post 10 has some good photos)
Sounds like a good idea, and I believe you end up with a warmer (or more neutral) tint. If I see it again for $19.99 I might buy another one to mod.