There's no recipe how to do what you're asking. Perhaps if you provide more details, we can provide some guidance. It sounds like a pretty long shot to me though.
"Schiefgehen will, was schiefgehen kann" - das Murphygesetz
The design of a 2-stroke engine is so fundamentally different from the design of a 4-stroke engine that the most suitable answer is "it can't be done".
