Cryo: Legal fees of $2500

Ask the cryonics organization that you plan to have freeze for any forms or templates they have. Having a lawyer check them over should be cheaper than having them made from scratch, and they'll probably be better, too.

I know it's not much, but I would gladly throw in $50 if you go through with this. For Life!

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?

First, shop around. Clearly they are unfamiliar with "cryo[ge]nics" and might not be the best outfit in your circumstances. Second, maybe a template like this can lower your cost.

Have you considered trying to locate a Canadian cryonicist that has already had similar legal documents drafted? Perhaps the relevant cryo providers would be happy to ask around for a Canadian volunteer who already has such an agreement to discuss this with you. After all, being able to obtain this agreement is a prerequisite for you to become a customer, and so it is in the cryo provider's best interest to assist. Once the person is found, you could either ask whether you can use a copy of their agreement, or if it belongs to the lawyers, you could ask the lawyers to give you a better deal since they already drafted one of these and can make changes to the existing copy.

Also, if you choose to lead the construction of a public domain contract for this, then stating that this is your intention may draw more interested people to pool money, and would also result in making a much bigger difference to the world when you overcome this obstacle. You might also find additional resources this way like lawyers who have experience with these.

I don't know enough about law to tell you whether it's likely to be useful to consult an IP lawyer to ask whether a contract, once bought, can be placed into the public domain, but I know enough about human nature to know that if lawyers have a way to prevent their contracts from being released into the public domain, they will want to use it.

Or you could make temporary arrangements like the Alcor website recommends. They say not to delay because you might find yourself in a situation where it's too late. If you get something adequate set up now, you can improve the setup and make it ideal later.

Not to rain on your parade, but even having a complex legal framework in place is no guarantee it'll have the desired effect.

Who knows what these contracts will or won't imply decades down the line. Once you get older, you'll have to have them rechecked, which may be more expensive than was having them drafted.

There may be little substitute to having a family going through with your wishes and organizing the relevant details upon your passing, or you yourself being sufficiently powered on until shortly before your death to facilitate the immediate next steps.