What you are looking for is someone who can supply you with 1.5mm sheet metal (aluminum, stainless steel, or mild steel), and cut the switch holes into it using either laser, water jet, or CNC mill. Ideally you want someone that can hold 0.025mm tolerances, or as close to that as possible.
JIS 91-key layout is a standard, just like 87-key ANSI or 88-key ISO. Some keyboard manufacturers deviate from the standard and put odd sized keys in certain locations, but fortunately the QFR doesn't suffer that issue.
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Ah, great, now I have specifics to work on asking people.
My CM QFR plate looks exactly the same like the one posted by grendel. Even has about the same quality of desoldering - generally clean and no harm done, but not perfect.
Guess my next move should be to look for that 'someone'. Can I ask you what kind of people do this cutting? Do you call them metal shops or what.