I got a reply back from rietdairy.nl. Here's what they wrote:
"We do sell moulds all over the world, in case you need materials, please inform us. "
They don't mention anything about private hobbyist orders, which is what I asked about, but since I got this answer, I assume they will deliver my order.
I sent an email back to them asking for wooden mold sizes (or did someone find them on the website?)
I'm thinking there's about a 50% chance I'll make an order. So anyone in Finland wishing to make a group order, now's the time to react. (If I become 100% sure, I'll post something to the geographic board).