You can use motorcycle fork oil in your honda PS system, cos that's what the factory honda ps oil is. Unlike most other car manufacturer's ATF based PS fluid requirements. Using ATF based PS fluid will cause damage to the system in time.

But price of fork oil from Castrol acutally more expensive than buying from Honda hence I never bother getting fork oil from say supercheap auto or repco. If you need the right PS oil on sundays where honda dealers are closed then yeah.