I bought little laptop stand attachments for my keyboard and installed them backwards so that I can flip up the part of the keyboard closest to me whenever I'm typing while walking. It was like $10 vs $$$$ for the proprietary stuff.

Edit: here's what I got. Nillkin Computer Keyboard Stand... https://www.amazon.com/dp/B09LYWQQ3C?ref=ppx_pop_mob_ap_share