Can CTAs run their client accounts through offshore brokers like FinFX?

I was wondering if those who are registered CTAs can manage their accounts through non-NFA registered brokers like FinFx or if being a CTA necessitates only working with registered brokers.

The general reason is if one wants to extend trade signal services to others in the situation in which a system calls for higher leverage. FinFX has a PAMM system and it would seem to make sense to utilize them as long as the various investors are aware of the implications of trading with non-NFA registered brokers.