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it would be a lot more work but my honda reflex 250 has a 2speed CVT that works like what you're talking about. It's a full cvt but there is a 2step final drive built in that allows you a shorter gear for 0-40mph and a taller gear for 40-80mph. Its a little clunky during the transition phase but there is a fix for it to keep it nice and smooth.
if you could find an old Reflex transmission all you'd need to do is mat it up to the current 400cc engine and it seems like that may be easier than trying to fabricate your own from scratch.
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