Practical General: always shop around for a lawyer. Use google to find specialists in the relevant field, the more familiar he is with what you need done the more effective (including cost-effective) he will be in doing it.

Practical Specific: this area of law is likely unsettled and whatever is worked out beyond a garden variety will is likely to not have much practical effect on your remains getting where they need to be in a timely manner. To ensure expeditious handling of your remains you probably should make sure that you maintain close connections with reliable people who are well apprised of your wishes (and that those wishes are clearly documented, this is a simple matter of creating a will that a trust and estates lawyer should be able to advise you of cheaply).

Theoretical: Does one increase one's chances of reanimation more by signing up and planning for cryonization or by allocating an equivalent amount of resources to bringing about AGI?