I guess it depends how you are with small detail work. If you have a steady hand and a good magnifier glass and some really nice detail brushes it might not be too bad. My grandpa paints models and has for decades and he has a really nice magnifier that stands on the table so he only has to hold the model under it to make it easier to see close up.
Another option is getting them unpainted and finding someone local to paint them for you?
Yeah, that may be the best way to go. That chasmfiend is amazing and deserves a nice paint job.