They make a adapter that mounts to the middle of the blower pulley. They make two different ones, are the bolts evenley spaced or is one bolt hole off just a little? I have one that the one bolt hole is a little off that I am not going to use. A new one from Casale is $165.00. I don't think that is going to solve your problem with turning the motor arround it will just help the boat turn left. By the way your going to have to buy a right hand prop also because driving off the front of the motor the drive shaft spins the other way.
Bill