Hello Morrisman,
There is a guy in NSW selling the Indian Lister clones and a range of alternators, belts and pulleys to suit.
They probably don't sound cheap, but by the time you get material, tooling and taperlok fittings it is worth an enquiry.
His website is
www.ozlisteroid.com and he has prices there. Look under "Other Items" . He has both the automotive and industrial belts and pulleys.
V-belt losses are not too bad as long as pulley sizes are not too small. Twin A section is a fair compromise and if you go with say 12" and 5" or 5.5" pulleys you will be in the speed range and not need excess belt tension.
Regards, Combustor.