Libertarian Party of Canada - Welcome
Though we'd usually think of it as a right-wing party, it does have a few points that could be attractive to the left:
On native autonomy:
"We call for the honouring of all just claims of native people to land, property, and autonomy."
On military strength:
"We support the maintenance of a military establishment sufficient to defend Canada against foreign aggression."
Unclaimed territory and disputes:
"We oppose the recognition of fiat claims, advanced by nations or international boundaries, to currently unclaimed territory such as the ocean floor of extraterrestrial bodies. We support the development of objective standards for recognizing a claim of sovereignty over such territory."
Honestly, there's not much else that Libertarians have in common with the left in general, and in some respects, the Conservatives have more in common with the left than Libertarians do. But considering that there are currently specific core areas where the Libertarians and the left want similar changes, I could see the value of a Libertarian-left co-alition specifically to bring the troops home and then honour all just contracts with the First Nations. Sure the co-alition would likely dissolve after that, with the Libertarians going back to the Conservatives, but this time with the constant threat hanging over Conservaive heads of going back to the left if the Conservatives try wasting taxpayers' money on foreign wars again.