Using FlyPT the best solution I’ve found is mix sway and surge into roll using gravity, and on the normal roll axis use roll/pitch speed (rather than simply using roll/pitch angle).
The speed (rate) part gives that instant response to roll/pitch inputs and let’s you feel the turbulence nicely, and gravity behaves much the same as roll/pitch angle while it doesn’t suffer from the same “over the top” issue of using raw roll/pitch position.
Basically if we use the example of a roll - as you go up past 45 degrees it actually starts to reduce smoothly until when upside down the rig is back to level. As you go over the top it increases again. This is as opposed to roll angle which suddenly lurches over and needs spike filtering.
It’s not 100% perfect, but it’s the best solution I’ve found thus far for giving a natural and very enjoyable flight experience even with aerobatics.