Exactly that. Royal Kludge makes one.
I think it’s a good layout. I have a tenkeyless at home and for some tasks I definitely miss the number pad more than I’d miss the arrow keys, especially since the number pad by design doubles as arrow keys and always has. I’ve seen even smaller keyboards that have numpads but not the number row, which would also be sweet. Reclaim some vertical deskspace as well as horizontal.
I think it’s okay to keep discussing this because the app situation is very much in flux at the moment. I’m on Jerboa because it’s the best native app I’ve found that plays nice with a folding phone and Samsung DeX. My requirements are simple, but they are niche. I’m keeping an eye on a few other apps though because while Jerboa is great as it is there are improvements to be found.