A bit of good news emerged from the woodwork this past weekend for anyone who might be using a rootless jailbreak on their iPhone or iPad such as Dopamine for A12-A15 devices running iOS or iPadOS 15.0-15.4.1 or palera1n-c for A9-A11 devices running iOS or iPadOS 15.0-16.x.
Cephei Tweak Support updated to v2.0 with rootless jailbreak support