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I work this way. you can rectify that problem using a lap desk or a smaller desk, like a portable tv tray, and an ergonomic keyboard.
All you have to do is crank up the text size and its perfect. I can split my “monitor” into 4 smaller panels and its made me more protective than ever.
32" Portable Curved Shape Light... https://www.amazon.com/dp/B019J91KIS?ref=ppx_pop_mob_ap_share
I was in a similar situation but gave this a shot and have been happy so far:
32" Portable Curved Shape Light Wood Lap Desk by Trademark Innovations https://www.amazon.com/dp/B019J91KIS/ref=cm_sw_r_cp_apan_glt_i_N86JC663BGZ49FKAFXT2?_encoding=UTF8&psc=1
It's not perfect and you'll still need to take breaks and stretch but it's been significantly better then any desk & armrest combo.
I tried a motorized adjustable desk that didn't go low enough and found that sub 30" desks are hard to come by. I found some adjustable school desks meant to be adjusted for different grades that I thought would work great. But even setting it at like 24" was no good.
If you're open to other options you could try this:
32" Portable Curved Shape Light Wood Lap Desk by Trademark Innovations https://www.amazon.com/dp/B019J91KIS/ref=cm_sw_r_cp_apan_glt_i_MZCC31P8R53X5X8CZ6QT?_encoding=UTF8&psc=1
You can either rest it on your lap or on your armrests. The main downside is how cumbersome it can be to get up/sit down each time but the trade off has been worth it for me.