Canadians have to remember that we are really buying glider kits in a Cobra box. Have manufacturer issue separate invoices for kit parts. Ship to US port. Arrange spots to store kit parts on both sides of the Canada /US border. Bring no more than $100,000 CDN worth of aircraft parts across the border at a time.

If you don't arrange with RIV (Registrar of Imported Vehicles) ahead of time, there will be a delay of some weeks while RIV performs its bureaucratic self abuse before you can take the trailer back across the border to retrieve the remaining kit parts. Perhaps you can swap trailers with a buddy with a compatible glider.

Likely the border will be open by the time the tax becomes effective.