This[2] is my dream keyboard. Totally standard layout, except the number pad is moved to the other side. Unfortunately, no one makes these, and I came across this one after the group buy was already done.
[2]: https://switchplate.co/collections/southpaw-full-size-group-...
[1]: Really, they should be called right-handed keyboards. Left-handed mouse users can already use a regular full-size keyboard without the numpad getting in the way.
My preference is quiet butterfly keys when it comes to numpads for cad use, at least in shared spaces.
Looks like there's not many options out there. This "accounting" keyboard with ergonomic keys is... very intriguing as well. Just wired, and aggressively fugly.
https://www.amazon.com/Ergoguys-Handed-Keyboard-Wired-Black/...
Looks like Microsoft Sculp with separate numpad might be worth a try before custom options.
I tried the Sculpt keyboard with separate numpad and didn't like it.
I have one without the numpad actually.