Bb86.5 can't be converted to a threaded bb, but can use most of the cranks that a threaded bb can use with the appropriate bb. I couldn't find details about the bb needed for that oval crank, but if both bearings have a 24mm inner diameter, it'll probably work with a Shimano press fit bb. If it has a 24mm driveside ID and a 22mm non drive side ID it'll probably work with a Sram press fit gxp BB.

Sure way would be to contact Fuji.