Using the emergency access feature for this sounds like an incredibly ill-advised thing to do. There are already legal processes that bypass the probate process (declaring beneficiaries). Where the same beneficiary process largely bypasses claims from creditors. Doing this could be an incredibly costly move for the estate and open family members up to lawsuits from those same creditors.
Having accessing to a loved ones email/pw manager can be great for learning who to contact on death. I can understand accessing Proton to export beloved and cherished photos in drive, or heartfelt emails between family that need to be remembered, but in my opinion:
If a loved one dies, you should not use their PW manager to access financial accounts beyond downloading the most recent statement.
Edit: If this is something parents (US) would like to do then a joint bank account would achieve the same result.