I have no personal experience to offer.
There is a podcast by Matt Rutherford, single
handed sailing, where he often talks about the arctic and the NW passage, among other things. 2 reasons I mention it: 1. He often mentions somebody, “victor”?, who seems to be an expert on the ice up there. If you are planning a trip, might be somebody you would want to talk to.
2. I think he said in 2018 only 2 boats got through, one going west to East (Thor?) and the other East to west. Haven’t caught up to 2019, so not sure what happened.
If you are planning a trip, good luck and I would be interested in hearing about it.