Yes the bank authorities are restricted by the rules of itself.You may create a trust and may write a WILL as per your wishes and deposit the WILL after getting registered in the bank or a with a person whom you trust,so that after your demise the entire funds of yours would be transferred to the trust or for any beneficiary organisation legally.For this you have to follow some simple procedures.

In terms of nomination rules only one person can be nominated and not an artificial person. Execute a will and hand it over to the trust.