You ask the unanswerable question, Hans.
The righteous, the pedants, the perfectionists and the rule makers will say an emphatic; "No!"
Many of the alpine gardeners of my acquaintance might err on the side of: "If it's only a few, then what the heck?"
Legally, it's probably; "No!" Morally, it's less clear cut.
I suspect the majority of us have carried seeds into (and out of) the country and many will have posted seeds around the globe - commercial operations could certainly be more of a problem.