nice to see some members venturing this way
Can't think of any hire places that do RIB's
But there is one guy who sells and repairs RIB's tha may have something or at least point you in the right direction.
He has a few used Zodiacs for sale that may be OK. Nothing really above 5.5 m though.
His email is on the site ,so drop him a line.
Good thing about his place is, that he's only a few hundred yards from the main launch ramp in san diego bay.
Good luck and drop me a line closer to the time.I would be happy to show you around