I have one with a rotary knob that I hooked up to my debugger so that I can step forwards and into fluidly.
This May Pad kit is great (https://keyhive.xyz/shop/may-pad)
Also great options from keebio (https://keeb.io/collections/macropads)
The tidbit is also really cool! (https://nullbits.co/tidbit/)
Again, just options if you feel like this would be a cool project and you're cool with doing some soldering. Other people have suggested good pre-built solutions, and many macropads can do what you're looking for.
Btw I did exactly that! I cut (literally) a cheap keyboard at the numpad boundary. Installed AHK (Windows) which runs macros on button click.
Postits to label each button.
Now I have one of those fancy few-button keyboards that do my bidding.
I've been meaning to post it. Would that be interesting?