A good idea, and I do like ideas. I like ideas even better when it's not for someone else to do. You volunteering?
I think the best way to start is to advertize those other events (I never heard of them), make them welcoming to participants, and see how well they are attended. I'd love to see more events, but I'd prefer them to all be different, not all the same.
My hands are full with attending the three events at EOHC (Winter, Spring and Fall), so I doubt that I'd go to more than maybe one more event. You might find a few guys who would hit most (but not all) of the events, but the numbers would be a handful IMO.
The biggest hurdle is probably the notion of coordinating dates. It would be impossible - it's a challenge to coordinate our Milshoot just with other EOHC events, much less other clubs.
A lot of guys like using a different gun for each Milshoot.....