I had Financial Power of Attorney for my late mum, and wanted to open a separate account for her pension to go into, and her contribution to Nursing Home fees to be paid from by Direct Debit. I couldn't!. Was told that as the FPOA didn't include opening an account, just operating them, Mum would have to come in and open it herself!.
She hadn't the capacity to do this as she was in hospital for months by this stage. I eventually got Enduring Power of Attorney, and could do it among other things, but as Mum died in hospital soon after, the Nursing Home Fee issue didn't arise.
So, I hope it works out for you, and be prepared to face barriers.
Darth.