Make it.
Seriously.
Easy enough on a lathe with some aluminium, acrylic or even ply.
I make Takahashi "manhole" style plug dewshield caps out of laminated plastic card - very simple!
I have even made them before out of cardboard, then impregnated with superglue (thin stuff) then further stiffened with resin/bog. I have even seen people make them out of papier mache! (suitably weather varnished).
Great creative...
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