I actually use a Yoga ball as my chair, have done for around 6 weeks as my old chair fell apart and i thought i'd try it. I actually really enjoy it, but was reading about the potential issues of using one for the full day. Being able to switch between yoga ball and standing should work well.
I was going to suggest this... lol
I don't think any high adjustable test could take the weight of my setup..
2x 28" 4k monitor
3-4x 16" MacBook pros
2 bookself speakers
mouse... desk matt, two computer docks, headphones dock, all the stress and figet toys... and a desk lamp
Also I will have issues placing a white board if I had a high adjustable desk.. let a lone all the wiring that have to be raised and lowered...
Every desk at work is high adjustable and hardly anyone adjusts them including myself.. only the cleaners to hoover under the desks themselves as we spend the first 5 mins adjusting our desks back so they one
Even thou I got a really good office chair, I have to get up a stretch my back every now and again as I did my back in a few years back.. the apple watch (I assume others will do it too) will beep at me to get me out of the chair.
I tend to use yoga ball for the first few hours of the day.. it's good for my core.. but I've seen two different types of stool that's peeked my interest;
a kneeing one; thou I have issues with my knee as well.. lol and one that rocks (Leitz Ergo Cosy Sit-Stand Stool)