I agree with everything
@tumbleyoda said. And I think your ideas are fantastic. I would love to see things heading in that direction as well - slow down the focus on moving up levels and push for focus on technique.
I've found that looking at preschool curriculum is a fantastic way to see the progression of basic tumbling. They have to add in so many little extra skills to build the strength and coordination that older kids might already have. With cheerleading, we tend to go straight from forward rolls to handstands. Where are the straddle rolls, pike rolls, lunges, T-levers, etc? So many progressions are skipped because we are crunched for time trying to get the kids to the backwalk-over or back handsprings. You don't have to master a pike roll before introducting levers, lunges, and kick up to handstand but I would definitely include them in your curriculum for basic tumblers. I believe the F.I.G. code of points should also have different drills listed for common problems? When I first graduated out of high school and wanted to be a judge, I bought a book (can't remember if that was the code of points or something different) for the compulsory routine breakdown and it was very very helpful in seeing exactly what skills are supposed to look like.
Personally, I've never been been taught a kip-up in gymnastics. We used to do them for fun because we thought it was a cool "break-dancing" move. I'm not sure of where the progression of that would fall in to.
Technique magazine is a great resource! You used to have to be a subscriber to get access to it but now they have all their issues online! It's very gymnastics based but I love the injury prevention and tumbling drills they give in some articles. I typically only find one, maybe two articles from each issue useful for transferring over to cheerleading (since I don't own a gym or run a rec program).
Library | Legacy USA Gymnastics
Debbie Love is a another fantastic resource from the cheer and gymnastics world. We had her come out for a tumbling clinic to teach our kids and I learned more than they did. She took them through a basic tumbling warm-up that covered everything. I will try to see if I can find my notes from that and PM them to you if you'd like.