I'd join Alcor in an instant if I were living in the U.S., but sadly, lack of access to an agreeable life-insurance company and compulsory cremation in the country I currently reside in work against such a plan.
On page 15 of Cryonics magazine (Summer 2006) show that there are countries that have Alcor members: Australia, Canada, Germany, Mexico, Monaco, The Netherlands, Thailand, The United Kingdom and even a few members in the United States.
Have you talked to
Diane Cremeens, Alcor's Membership Department Coordinator, about how to join? (I hope that she doesn't mind me posting that link.)
As far as insurance goes, you are making a donation to a nonprofit organization. I don't try to explain cryonics to them. Some people leave money to the Red Cross, or a church, you just want to leave money to a Life Extension Foundation, Federal Tax Number ---- (I'm not posting their number, you can ask them for that information.)
I never had trouble getting insurance as long as I didn't go crazy on them about wanting to live in the future.