I too wanted to have loadiineGX + pygecko on 5.4.0 as well.
That way, XCX should work on 5.4.0.
Unfortunately, I don't see any codehandler540 in Github of pygecko.
Not sure if the 532 one would work or not.
And if anyone have some knowledge about how to combine loadiineGX and pygecko,
please kindly share it or point us to a correct direction.