Customs will 100% intercept seeds and cuttings.
Customs is already super weird about plant material and products of any kind, anything alive requires a phytosanitary certificate…seeds are nominally OK, but they’ll confiscate foreign Cannabis seed orders still. Maybe they aren’t aware it’s federally legal, maybe they just don’t like us…IDK.
That being said, all sorts of contraband shit still makes it all the time, they can’t check every package.
I highly suspect international overnight packages are subject to greater scrutiny than standard mail, but you’re also racing the clock in the middle of winter.
It can be done, might take a couple tries in this weather. Lotta cuts could fit in the front pocket of an old hoodie. I mean, for the international customs form…“etsy custom tie-dye sweatshirt”