I've had a standing desk for 8 or 9 years now and I stand probably 75% of the time. When I sit, my chair is not very comfortable but also standing isn't always ideal either. This is while also mixing in 2-3 walks or jogs through out the day.
After working for ~8-9 hours in that environment and being up for 14-15 hours, sometimes when I'm in a vegetable state where I'm laying in bed watching a movie I feel highly motivated to work on something but I don't have a laptop and the thought of getting back up rarely wins.
With that said, I'd say my most productive "programming thoughts" happen right as I wake up and am laying in bed. I often spend 15-20 minutes thinking about exactly how I'll solve something and then get to that during the day. This is for both work and personal projects.
Definitely think your idea is worth trying for yourself.