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NuPhy’s got some interesting options as well. https://nuphy.com/collections/keyboards/products/halo75-v2-qmk-via-wireless-custom-mechanical-keyboard

The low profile space is a little tricky. It leans into column staggered ergonomic boards really quickly. Kailh’s Choc switch is as low as you can go, but those folks get really custom really quick. They’re not big on function rows or arrow clusters, so the next step after Keychron or NuPhy would be something along the lines of the Afternoon Breeze. https://www.afternoonlabs.com/breeze/

Have you taken a look at any of Keychron’s offerings? https://www.keychron.com/products/keychron-k3-max-qmk-via-wireless-custom-mechanical-keyboard Checks most of the boxes other than the knob.

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