This is a very good feature and yes, Koen, that would help a lot of people out. As already said, this is actually one of the strongest features of your competitor Revolut. By allowing the use of credit cards (CC) without fees, lots of client choose for Revolut to have immediate top up AND to collect miles on their CC.
This way, all expenses can be converted into a CC transaction. It is also the same service offered by Curve Card, as well. If Bunq implements is, you're tackling TWO Fintech competition at the same time!