The only single belt setup I'd consider would be a serpentine. Those belts have enough traction on the pulleys that they can operate all the accessories in a single plane, and with idlers and a spring tensioner, the accessories can be bracketed to both sides of the engine. Since stovebolts went out of production long before serpentine belts came into use, the brackets will all be custom fabrication items.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!