This is what I use however I rarely teach it to anybody. Imo, it something you just figure out with enough aerial awareness but this is also coming from a boy POV as in " that looks cool, lemme try it, ezpz "
One drill is to do side cartwheels off a block into a pit. I had a decent front and back salto and just taught it to myself on tramp. I basically thought of it as bounce high, do side cartwheel in the air. However, it's opposite of an aerial since you want you height rather than passing through a deep lunge where the chest drops and you kick over. My boss said I probably saw it in the Matrix or something.
Learning arabian is probably a better idea as it can be applied to more events.
Arabian:
Start doing round off rebound 1/2.
Add to doing a roll out of it onto stack mats, building the mats up.
Then round off arabian dive roll.
Develop a good 1/2 turn in the air land on stomach "airplane" on tramp