Due to the hubmotor Ebikes using freewheels there are vendors supplying 7, 8,9 ,and even 10s parts. The play in the bearings makes indexing over 8s questionable to me. The manufacturers seem to be coming out of the BMX market space where freewheels are still used.
DNP is a brand. I took some single speed Chinese freewheels apart (including DnP) and wasn't impressed. A single wire spring wraps around all the pawls. The notch for the spring almost cuts the pawls in 1/2. if the spring breaks you lose all the pawls. They aren't sealed and rely on heavy grease, which does make them quieter than more expensive (single speed) offerings. They're cheap, if you find one you like I would suggest having a spare.
Whatever Chinese sources work for you, or Ebike shops should offer them. They do go down to 11t, where the classic ones stop at 13t.
The 6 pawl 72 POE versions aren't any stronger than the 3 pawl 36 POE parts. The pawls work in sets of 3. more noise, and more drag with the high POE parts. I have no idea what's inside the classic freewheels mentioned above.
If you take one apart they use loose ball bearings, and they're adjusted with shims. Perhaps better bearing and some custom fitting might improve things?
I've never used these.