Rather than just work this out all myself, I'm going to detail out how it works so other modders can pitch in and help.
To trigger the change you would use this Sandbox+ command:
customization_swap_player_rig( "cm_body.rig", "Rollerblader" )
You would substitute one of the other animation tables for "Rollerblader" in the second parameter if you wanted to use cop, brute, or other animation sets. Most sets are missing the basic player animations though, so you would need to copy over the entries from plym or plyf and then change the actual file it uses to one of the special ones.
Hi, I tried going that route, modifying the rollerblader.xtabl file and using customization_swap_player_rig to swap to it. I get a big problem doing this, my character does also swap mesh and it gets kind of ugly, particularly the hands. I guess the character mesh is swapped to the Grace mesh.
So I instead modified Plyf.xtbl and this works. I then tried to modify Plym.xtbl to get this work on a male character, and to also inherit some of the male's animations, since I think this is things are set up. But I get nothing out of modifying this file. I tried with both a male and female character, but I only get the effects of my file changes to plyf.xtbl