Assuming it works on AIX (something about which I have no idea), might the simplest solution be to package your script(s) with PAR, which will package all the required codes, runtime and modules into an executable?

Whilst the output file size can hardly be said to be small, I think it would resolve your issues with different layouts of file system on the different machines.

There is a performance overhead as the .exe is unpacked every time it is called, but this may be acceptable for you depending on the function of your code.

Hope this helps