This is a really cool hack, and I’m happy that the author found a solution for their pain that works for them, but this bit confused me.
Kinesis are keyboards with separated key clusters, but not split keyboards. When one says split keyboard I think they are normally talking about things like the Ergodox EZ/Moonlander which have two physically separate bodies, one for each hand. There are many different models of these with various shapes and sizes, and you can separate them as much as you like. The normal advice is to set them up around shoulder width apart so you aren’t rounding your back to bring your arms together.
Most of these kinds of keyboards also support whatever key switches you prefer, and there are plenty of options that are sufficiently quiet for zoom (pretty much anything linear should do the trick)
I have been using a Moonlander for a couple of years now, and an EZ before that. They are expensive at around $400 but I don’t think I can ever go back. Most of these split keyboards also run QMK so you can setup binds, layers, and generally configure them however you like.