The Crecy was not low noise and the crankcase oil stayed golden.
This means that all piston and sleevevalve lubricant took the easy way out.
Some pollution
All true Neils, but then the crecy was for military use and they just didn't care
Just thinking , given that you are trying to design a relatively low performance, quiet and clean two stroke (i.e. something ideal for portable generators etc.). How about a stepped piston (twin) design, so you can separate the crankcase oil ?
Your poppet valve and cam might need some pretty good lubrication, which would be potentially smokey if in a petroil mix.