Could trying to fit a dissimilar country's system to our own result in a broken system?

It could, but I don't see that as the likely outcome. Dissimilarities with other countries are greatly exaggerated, and government is better at getting things done than many people give it credit for.

It is possible that the result would still be broken, but it is certain that the result of doing nothing will still be broken.

We can either just keep things broken, learn from what others have done use those lessons to take our best shot at fixing things, or we can completely ignore the hard-won lessons of others and go for an untested and novel approach. Which is most likely to work?

Maybe first figure out exactly what is broken and why?

Seems to me that this has been pretty thoroughly explored already.

In that case it would be interesting to see the premise that gets us from "US' healthcare system is horribly broken" to "Canadian healthcare system is a suitable model."

Things like cost per capita and outcomes lead you there pretty naturally. We pay a shitload more and don’t get noticeably better results.