[Kib]

A possible solution for pkscuot:

It is also possible to have an addon patch skin files at startup.
I know of at least one addon that does this (SpotiMC) in order to work in (almost) every skin.
The patching is detected / done on every addon startup so if the skin updates it will just be patched again when necessary.
I can't help you with the code myself, but you might be able to use a similar approach.