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> You can do that without changing the parser.
> All you need to do is to use the upvalues in the
> desired order at the start of the function before
> referring to anything else.

Indeed. And it seems a perfect job for ltokenp which I've just announced!

Just replace
	function X (...) <U>
	function X (...) local _UPVALUES=U
taking care to handle empty or missing <U>.

A simple state machine can do it.