I don't believe there would be a problem with Dutch only channels, however, I'm not certain how we would test playback as we don't have a VPN into the Netherlands for testing. The other issue would be: does the government of the Netherlands approve your use of their streams within your channel?
Assuming that we, and you can resolve those issues, as long as you describe the channel as "Netherlands only" in your channel store description and perhaps also in the splash screen, then there should not be any issue with publishing in the Rest of World channel stores.
"The channel needs to do IP filtering if its content is restricted by region." and
"The channel should not be available in channel stores for regions it does not support."
The first one, we have never enforced this as far as I'm aware - it is up to the developer to respect the regional licenses for content they are streaming)
The second, your channel is already in the Rest of World region, so that would already be true. Just don't submit for any other regions than Rest of World.
You can send me a private message if you want to discuss further.
- Joel