just an idea:
if your LODs Model (_1,_2,_3) stil have the same bones like your main model (_0) cant you just change your code to ent_animatefrom instead of ent_animate?
That case you have only one model with all the animations instead of 4. does that work?

Edit: Ah shoot, maybe i should read better. Your talking about point animations, and i talk about bones, sorry - forget it