Thanks for that info @bnhf, I still haven't tested ESPN4cc4c yet, I'll give it a go later this week to see how works.
I think my setup for now will be to keep my ESPN linear channels using the Hulu app, these will stay focused in the background on (2) of my HDMI tuners/FireTv sticks with ADB. That's the closest I've gotten to the previous TVE experience that I can channel surf like a cable box and use multiview.
Then run either FDL or ESPN4cc4c on my 3rd tuner with a 2nd ADB instance so it doesn't close Hulu on my main (2) firetv sticks, and I'll watch ESPN+ and other Sporting events, with Fox One etc.. on that 3rd tuner.
Still doing a lot of testing to see what's the best solution that works for me 


I suppose Google Assistant would be another possible route for device manipulation, but probably without sufficient control for program selection.