> preferrably with 36 or less keys.

I think it's worth emphasising that these small keyboards bring the full functionality of the keyboard to within reach of the hands resting on home row.

They aim to increase comfort by reducing hand movement, and stretching / use of the pinky fingers. This benefit comes at the cost of a (slightly) more complex keymap.

The key thing isn't "less than 60 keys", it's "two or more thumb keys on each hand".

Some of these ergonomic keyboards opt for more than 34-36 keys. (e.g. the Moonlander is relatively popular).