American Express trav. cheques in Cuba?

Question

I'm going to Cuba. I am Canadian. The only travellers cheques that you can get at the banks now are American Express! (Figure that one out!).

Anyway, I have heard that even I get travellers cheques IN CANADIAN MONEY with American Express, Cuban banks will not take them because of the affiliation with "American".

Is this true? Any alternatives? I dont want to bring cash! All the Canadian banks have only AmEx trav. cheques.

btw Thomas Cook trav. cheques arent offered anymore in Canada apparently.