As MDB points out: the Phonak TV Connector plugged right into that optical output jack is the BEST way to go - well, unless you want those TV Ears or some redundant headset over the excellent aids you’re wearing.
Like you, I’m a POWER USER! My rechargeable Phonak Lumity Life aids only last 12-13 hours in a normal day, with little to no streaming until the evening entertainment. I think that’s pretty LAME, but my solution was to go buy a 2nd pair of the identical, rechargeable aids. Think about it.
If you NEED the aids (like I do with my cinderblock ears), you can justify the 2nd pair as a “backup” if either pair dies or needs servicing. I used to use my battery-operated Marvels as backup, but then that defeated the whole purpose of never needing to buy batteries - DOH.
Now, at 67, for the first time in my life, I have TWO identical pairs of aids to swap out throughout the day. I wake up, put in one pair, live LARGE (well, with little streaming and a prisoner of my home there are so many dang repairs going on), and then right after a workout/shower, I swap in the 2nd pair. VOILA!!! I could go almost all night being able to hear.
I really felt the need for TWO pairs of aids when on the road. Long flights, family gatherings, up till 1-2am, yada yada. It would not be possible for me to have that lifestyle without TWO aids to see me through ONE day. Too bad the rechargeable aids are pretty much replacing all battery-operated ones, cuz that limits our options.
Will be curious to know which route you go. Even if your “backup” swapped option is an older Phonak Marvel, they use the identical TV Connector as the new one! So you can just pair/connect them both up once, and as soon as the TV Connector is on, you’ll be good to go.