Active Record Encryption with Record Aware Custom Key Provider

I’m trying to set up a fairly unique implementation of active record encryption with a custom key provider. The custom key provider uses Current.account in the encryption_key and decryption_keys methods, however Current.account may not always be set. The records I am encrypting are “account owned”, meaning they should always have a reference to an account via record.account. I was thinking I could provide the record to the custom key provider via something like:

def initialize(record)
  @record = record  

and in my model file provide a proc to key_provider like:

encrypts :attribute, key_provider: ->(record) { }

But the problem is key_provider does not accept a proc. Is there another way I can provide a record to the key provider?

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