I have tin of unwanted sparks bought by mistake for my angle grinder, I wanted orange and yellow, but when I opened them up there was red sparks in there, not hot enough for grinding.
Personally I can't see why you can't have a twin cylinder with one side a 2 stroke and the other a 4 stroke,"best of both" then and call it the" Hovis"engine and you end up with a 6 stroke how flash is that :cheers