When it comes to Guardian and Vindicator - Mac is dead. Heather Hudson is the new Guardian/Vindicator. I think Alpha Flight only needs one or the other, not both.
For an AF movie, Mac is an important part of the backstory, but the movie story should be about Heather.
This comes down simply to my personal preferences. I prefer an AF led by Heather. To me, an Alpha Flight around her, Shaman, and Sasquatch is the perfect blend of she/he/thing that a small hero team needs.
I'm simply partial to small hero teams. I think part of the reason AF hasn't been a great sucess over the years is: too many heroes in one team.
Canada doesn't need the enormous X-Men, it needs the Fantastic Four.
If AF needs a fourth member, it would be Puck, not Mac or Northstar or anyone else.
I realize this is my personal revisionism. I'm just not too attached to most non-Byrne AF stuff. When Byrne killed Mac, for me it killed him for good.
I think the greatest flaws in AF over the years has been trying to resurrect Mac, not appreciating how cool Heather is, and adding other boring heroes. (Yukon Jack? Flex? Murmur? Man-Bot? Major Mapleleaf? Give me a break!)
I think if there could be a good AF movie, a necessary tenet would be: Keep It Simple, Marvel.