In theory you could replace most of the fluid with the forks on the bike using some sort of siphon but honestly I don't think it would be worth the hassel.
Of all the stuff I just got through doing to my Trophy - valves, air filter element, new fuel lines, carb synch, bleeding brakes & clutch fluid, the fork oil & spring change turned out to be the one job that (for me) was actually far easier to do then I expected. It takes sometime and there are several steps but they are all pretty easy and it doesn't require much in the way of special tools or know-how.
If you want some pointers on how to do it just let us know.
Keith
