Allow to add in Group Dms which are not accessible

Recently I lost access to my account which means I lost access to my data as well. One of the main places where all my important data along with my texts with my dead friend was there. That group dm was my only place and I'd do anything to get it back. If a user can prove it's their account in the group dm i don't see a reason why not support can't help and add the new account back manually.