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> Somehow I've managed to overlook token filters but they are clearly
> the way to go, especially given the performance concerns I have.

On the other hand, writting token filters in C unfortunately requires you
to know some of the internals of Lua, as the ugly line below shows:
(If seminfo contained an arbitrary Lua value things would be simpler...)

But if you're only dealing with numerical constants, then this won't be needed
(and the code I sent you can be made much simpler).