How to re-enable ADB, debug and Android menus—
starts around here (in German, long thread).
Not for the faint-of-heart, but works for 15.2.0 Tolino Vision 5, most probably soon for Vision 6 (different Android), and should also work for EPOS 2, Shine 3 and Page 2.
Adaptions might be needed for non-Linux PCs.