Phonak - changing from FM to audio shoe?

How easy is it to change from the design-integrated FM on a Phonak instrument to the audio shoe for audio input from other devices? I don’t think I’d want to do it that massively often, but it looks like it’s quite a job since the ML12i looks to wrap around the battery door and the AS12 shoe just slots in on a special battery door. What is not clear is whether the special FM battery door is part of the ML12i so it will pull on and off just like the AS12 or if it’s a whole unit that requires the swapping of doors. Anyone actually done this?