100% agree with having more keys accessible via the thumb, I used to have the KBD75 (with spacebar 3 way splits, so I have shift and ctrl right under the thumb) but they discontinued it.

https://cdn.shopify.com/s/files/1/1473/3902/files/75_v2_c821...

I recently learned that there are these from system76

https://system76.com/accessories/launch