Providing quotes in different currencies for the same subscription

[TrixabelleCP]

Example scenario that causes us problems:

A German based customer purchases their subscription directly with us in EUR. At renewal time they want to purchase through a reseller who only purchases in GBP and who wants a GBP quote. (we use invoice owner feature to represent the reseller).

As far as I'm aware the only way to provide a GBP renewal quote is to re-create the customer's billing account from scratch, manually re-create the subscription, cancel the old subscription/billing account, and re-quote in GBP. Obviously this is a LOT of work for a single quote that might not even be purchased.

There's got to be a better way to handle this? Anyone have any ideas?