You don't have to come in via air. Do this at the Canada-US land border.
Do they still just wave people through there, eh? You might have to carry it a long time to get searched.
Apparently they refused entry to, detained, and searched people wanting to go to the protests in DC yesterday. So just wait until an event like that happens again, which is likely to be fairly frequent now.
The US border guards even refused entry from Canada to the US of Trump supporters who had tickets.
My Dad has a mailbox for American packages just across the border, they seem to have quotas as his car is searched fairly regularly (it isn't a busy crossing).
I do the same, but with a Nexus card; never been searched, but I always declare what I'm bringing across.
The last time I even came near to, but not into, Canada via train, the train was stopped and heavily armed and body-armored CBP came on board to demand customs documents from everyone, including citizens not leaving the country during their trip.
The CBP at the tunnel in Detroit are right pricks, this would work a charm on them. They have repeatedly harassed me and anyone unfortunate enough to travel with me.
But if you get it seized before takeoff, maybe you get the $$$ back? :-)