You could not not be donor, permanent deferral.
also there is sometimes small amout of cccDNA left in the liver, thats why you should inform about your past infection if you gonna have some immunosuppressive thereapy. They can monitor for reactivation than, low chance but better to check.
Few percent of the people who passed hbv and are HBsAg- still have very low hbv dna in blood from time to time. That's why everyone who passed hbv is excluded from being blood donor automatically.
Anyway they will test blood for HbsAg ... right ?
I think you can since you are cured.
As I know you are banned for anonymous blood donation for life.