A better idea is for users to buy Gulden to increase the price and let the dev funding pay for the exchange. Is the 50k what bitvavo wants or wishful thinking? The devs can take the Euros back if the submission fails instead of users contributing and never getting the funds back if it does not succeed.
Alternatively sell Gulden at 2 or 3 times the price from the dev funding , at least the funders receive something in return. The listing on bitvavo will increase the price and this includes the dev funding who will receive over 60% of the reward each block.
Of course an increase of the price gives a bit more space for funding purposes like exchange listings and marketing. However, a part of the dev funding has already been going towards the Bitvavo goal. Slowly we're getting there.
Well the dev trough at 3c earns 85k in 2 months, at 6c it's 170k. I would expect that GAB to provide the remaining 30k for bitvavo.