Thanks to a tip from @neurovagrant, I have cancelled my audible subscription and I have created an account with libro.fm.
As I listen to audiobooks alsmost exclusively in English, any Dutch services do not cover my audio/listening needs and wishes.
To check if libro.fm was a good fit for me, I compared my wishlist at audible (currently at about 30 titles) with the libro.fm catalogue: apart from 1 title it was a complete fit.
Next up: copying over my wishlist from one to the other, check out the specific membership options (probably going for a 2 credit/month version again) and get ready to listen.
Biggest perk: you can Download Your Purchased Audio Books!
Second biggest perk: supporting an independent bookstore, unfortunately only in the USA at the moment.