In order to connect an external mic to an Iphone with osmo mobile, the bluetooth option is not a smart move (you'll loose the ability of connecting the app to the gimbal for e.g. tracking).
What we need here is either a lightning connection plug out from the motor OR a 90 degree plug with flat connecting cable

Thanks for your feedback. Your idea will be forwarded.

Hello, did something happend with this issue? Beside buying the Osmo mobile 3? Greetings

Nothing happened. The only way should be a diy solution, buying just the plug on aliexpress and soldering wires.