Well, your classification truly does not matter in the slightest. This is legal in the Nordics. You know how you make it illegal? By signing the CBA, which if you're already providing better terms, doesn't change anything.
Perhaps the world needs fewer Americans that speak so confidently about labour relations in other countries. As usual, 90% of what’s being said on this matter is utterly ill-informed back and forth by Americans that despite their best efforts can’t hide that they’ve bought in to the longstanding American anti-unionist culture.