So Im looking at the abc_export code. It would be possible to have 2 scripts, one that puts the UVs on there and then you can parent all the hair nodes under one parent, and then another script that exports that top parent node. Just depends on if you want the complexity in the script or in your actions. This script was designed to be as simple as possible for people to build on. Your setup and needs are a bit more complex that putting UVs on a rug.