You know Jan, if you want to see someone do something that has not been done, the next logical step is to do it yourself. Not being a smartass, just pointing out that is how I have always done things in the hobby, and it works.
What a shame no one does specialty leagues in VASl. Hmmm, what's to prevent me then? Not a thing. Applies to a lot of things I have tried in the hobby. If you lament the absence of it, chances are other people do too. Be the first to make a move to rectify it. No special qualifications needed. You will make mistakes as you start out, everyone does when trying out new ventures.
I believe the end result will be satisfying to you though and doubtless, to others. The ASL community is very giving when it comes to supporting such efforts with playtesting, proofing and recommendations. Go for it.