Am thinking of buying an older rear wheel drive farm quad bike, ripping out the single cylinder 300cc engine, and replacing it with a carbed SV650 engine

All for a winter project..
Fit some wider road wheels, a rev counter, and a speedo, then hopefully put it on the road for some fun... but what could I do for a reverse gear, as most farm quads have a reverse gear????
Would this be possible or am I living in cloud coo coo land