Yes I realise how a uniflow diesel engine works. That is what I meant in my original post. The 2 stroke diesel is very different to the 2 stroke spark ignition engine used in our VMX motorcycles. The crankcase plays no part in the fuel flow through the uniflow diesel engine. The bottom end is basically like a 4 stroke.
The turbo 2 stroke spark ignition engine is an interesting and I think a relatively recent development, or at least a relatively recent succesful development, I am sure it has been tried numeous times over the last 100 years. Supercharging has been used very succesfully for many decades in many different forms.