Dual Device controller ideas

Dears member

i have an idea and i would like to get your feedback and suggestion

I owned multiple mike such as R1250GSA, F750GS and on both bike i use bmw navigation and CHIGEE AIO-5 and my intention is to:

control both navigation through the navigation cradle and CHIGEE AIO-5 via the Wonderwheel.
Use a switch to toggle between two outputs: one for the navigation interface and one for the CHIGEE AIO-5.
The Wonderwheel will control the output based on which system is active.

i know that i will be asked why two nav device used?

basically i use chigee in cities or area where i can find cell reception, and GPS navigation on area that no cell service is available.

i know mobile could have offline maps or navigation app. i can't trust them. because even my mobile is not working related to battery issue.