Tell me about it, I'm trying to get an expense reimbursement from the NL to my personal bank account in the US. No IBAN, only SWIFT - nobody seems to know how to function with out antiquated system of very expensive wire transfers.

One way or another your bank has an IBAN you can use, but if it's a smaller bank, they may go through one of the larger ones. You just need to find the right person to talk to at the bank.

Even if US accounts had an IBAN (they don't, US banks don't participate in that standard) that wouldn't help. The Dutch bank can either process payments via SEPA (Single Euro Payments Area) or international wire transfer (which doesn't need IBAN but is expensive).

Maybe GP can make them use Transferwise, Currencyfair or the like?

I used Transferwise to send money from my personal NL account to my personal US account and it was pretty straight forward.

Yeah, thats my current plan of attack, but getting the sender to use the service has been a trial. They're not too keen on non-traditional money transfers.