bidirectional joystick conrol with saparate brake switch

Hello all, hope someone can answer the following:

I am busy with my electrical boat setup. It is a hybrid system where the orginal petrol engine will also remain. 

A ME0907 BLDC motor will drive the prop-shaft but as i can also make the BLDC motor turn will sailing on petrol => i want to use the regen to charge the batteries.

I bought a FLIPSKY 75450 and i have a hall sensor based joystick/throttle.

My idea is to use the joystick bidrectional;so, forward, neurtral in center position, backward. But then; i would like to be able to switch on the regen by a brake signal.

Looking at the different modes i am wondering if there is a combi that works?

Anyone an idea if that is feasible? Or is the combination bi-drectional joystcik and brake function difficult?

thanks, best regards Erik