Yes, so far Priceline/Flying Network/BudgetAir are able to find flights with KL-coded flights or at least the right one.
Actually I wanted to settle the booking in EUR because I would like to use my Amex to get insurance coverage and miles points in the process.
The only OTA that seems to provide sufficient information with regards to the booking is Flying Network by the way.

How is your experience on MF flights? I have seen some reviews of MF flights and it is always quite funny the way they propose their "western choice".