I know about changing the name or address. But it is not clear what the brokers can use to unDRS. If the key is the account number, then having a new account created with GiveAShare could avoid this situation. Maybe there are other ways to avoid this but I feel that it’s better solution for the moment, as there are so many things not clear

The first name, last name and address must be identical. If your middle name is Steve and first account has First name Steve last name and second account has First name S. last name then you cannot transfer and you would need a medallion stamp. Same goes for address. Feel free to try (as I didn’t have tried all the variants) and I will update the post with other experiences