I use aeropack retainers on my rockets with loki cases just fine. The only issues I’ve had was with a tailcone retainer, and that was because I didn’t install it to account for the difference in cases.
Normal screw on retainers don’t need anything special done while installing
I can confirm that the new Loki cases work fine with the Aeropack Tailcones. The old ones didn't but you could make them work by adding a thin ring of masking tape.