They way you describe the interaction between klipper and linuxcnc sounds a lot like how the mesa hardware functions that are all the rage over at linuxcnc these days.
I use a Mesa 7i96. It’s a fpga (i dunno what the hell that means) that handles the real time step generation and allows linuxcnc to focus on the big picture. By offloading this to the mesa card linuxcnc is less dependent on the real time capabilities of the computer. As you mentioned about the klipper, the mesa “doesn’t know anything about what it is doing or why”