Good news: I’ve just spoken to AZ about the 3 month limit on refunds, and as they archive data for performance and not compliance reasons, and as ticket-sales-volumes are low compared to other kinds of retail, they think it would be possible to store live details on transactions for Monad customer for longer (hopefully a year) without having to put too much work into building alternative solutions.
Not a promise, but if it turns out they can do it it might become available in a few months.