Dynamic transaction description

Is there a way to dynamically generate transaction descriptions (which show up on the transaction page at Buckaroo?

Currently we’re using a custom order sequence for our order numbers, a plugin to generate PDF invoices and sequential invoice numbers, and then there’s Buckaroo that uses the WP internal Post ID for its invoice numbering.

We’re trying to get some more context between orders, Buckaroo and our invoices, so we add the order sequence number to our invoices, but we’d also like to have the (custom) order number in Buckaroo.

At the moment the Buckaroo Master Settings’ Transaction Description is empty, so we thought it might be easy to use that field to add the order number to the Buckaroo transaction, but judging by the code, the value stored and loaded directly from the Options table with no action hooks or filters to modify the output.

I was wondering if
A) there might be another way to safely (plugin update-proof, no side effects) add this information to the transaction
or
B) another way to add this information to the transaction?