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> it seems that I need to add an entry to the "Value" union in lobject.h,

Without memory allocation, that approach cannot work because the
fields correspond to *values*, not objects, and so "foo.x = 3" can
never affect the value of "foo". Note that this is true even when
"foo" contains a table:  "foo.x = 3" changes to contents of the table
but not the contents of "foo".

With memory allocation, you'll be well served by ordinary tables,
without patching Lua:

function vec2(x,y)
        return {x=x,y=y}