Dear fellow Dutch, Finally a Straight razor hones are being sold at the east of the Netherlands at Arnhem:
https://www.baptist.nl/houtbewerkers...den-stenen&p=2

This shop is by the way a wood crafter paradise! It has all the tools and equipment you need!
I was like hopping around looking at the things inside there. And no, I don't get money for telling you this .

They sell the professional stones and the ones on a glass plate.