I did exactly this during lockdown 1 in the UK to allow me to easily control OBD for online guitar lessons (I used 3 cameras plus on screen pdfs in various comb

I did exactly this during lockdown 1 in the UK to allow me to easily control OBD for online guitar lessons (I used 3 cameras plus on screen pdfs in various combinations). It worked well (I did it because no one had stream decks in stock at the time), but it was pretty fiddly to set up or modify. I now have a steam deck xl, and it's light years better. Obviously 20x the cost, but well worth it in my opinion.