Are you looking for only prebuilts? What about layout?

Honestly, I think the HHKB is highly ergonomic in terms of the home row/split backspace/control location. However, it's not ergo in the sense of the ergodox or kinesis.

If you're open to customs there's infinite possibilities tbh.

A company called Perixx makes ergonomic-layout keyboards in a variety of sizes: https://perixx.com/collections/keyboards