KISS
Actually IMHO, if you are going to teach a non-native english speaker the words "green" "red" and "blue" then how much harder would it be to teach them the words North South East and West ? Then on top of that you have to teach them what procedures green red and blue entail.
The local tug driver/ ground crew may even know what North and South etc. mean once translated. It would then be alot more obvious what direction the aircraft was meant to face. There would be no problems for anybody, whether local or transient.
Just my two cents worth.