It can be done..I have done 4 or 5 using a Walbrs SDC80 carb and reeds from a Homelite chain saw..
the problem with the twin carbs is nylon blocks underneath.Nylon is not strong enough to use for a carb insulator block..It strips easily and the pulse passages are too close to the threads and always leak..Blocks are made from G10 epoxy board won't strip.
Block off the pulse holes in the cylinders and put pressure fittings into the case..Tap the back plates of the carbs and put pressure fittings in there also..When you make the new blocks you can turn the carbs to get a better angle on the linkage..I like to make the shafts parallel and use DuBro ball fittings to connect them together..Way cheaper than a single carb conversion..
The Horner twin is almost as strong as a G62, and no vibration...