The change to Munchkin V2 isn't tied to the move to the Google Cloud. Our Engineering teams identified some blockers that prevented the migration and have been working to resolve those since then. Many of those blockers are resolved, but I don't have enough detailed info to say exactly how close they're at yet. What I can say about Munchkin V2 is that they're just starting (just happened to get the email yesterday) to take requests for a waiting list once the deployment is ready. Reach out to Support to have your account added to the list.
With regards to the campaign triggers above, I can't say definitively whether that would work or not, now or when Munchkin V2 rolls out. Using constraints in triggers is always tricky because triggers are activated by actions happening now, whereas the constraints are looking for activity that happened in the past. With munchkin V2 it's difficult to know for sure because of how it goes through the replay action with the activity log. Best recommendation I have would be to Contact Marketo Support and investigate more directly.