Shell USA has Rotella T6 fully synthetic that is a tried and tested oil that performs well in motorcycles. It now even has JASO MA certification.
In Australia Caltex Delo 400 Multigrade has been verified by some Australian motorcyclists as a usable oil. Caltex Oils are not commonly available as far as I can tell.
Gulf Western have a couple of oils that they say are okay for wet clutches (eg. Premium Gold 15W-40 and Syn-X 3000) in the description but they don't have an official JASO MA oil in their range. Penrite and Nulon do actually have car oils with JASO MA certification. SCA is currently selling HPR Diesel 15 cheap and they say wet clutch compatible in the description, alas no JASO MA certification.
Maybe waiting for a 20%-30% off the entire range sale at SCA or Repco and buying a motorcycle oil would be easier than finding a motorcycle-compatible car or Diesel oil that gets deep discounts?
Motorcycles don't use much oil so most discounts will probably only save you about $5.
Please don't tell me you're holding off on changing the oils to try save $5 or $10.