I dropped a revloc dynaring for an 05 CRF450R into my gasser, been using it about a year, works flawlessly, like desertgasser said it takes some adjusting initially to get it right but now it works like a dream, haven't touched it since I got it dialed in (11 months?? or so).
AND it is adjusted so the clutch lever still works normally. True statement. It all depends where you shim it.
Don't really want (or need) e-start anymore because my bike never stalls.
I bought this dynaring for my Honda the week before Revloc closed. They were apologetic and told me they lost a patent dispute with Rekluse. Ran it in my Honda for over a year before putting it in the gasser.
The Rekluse EXP works on the same principles as the Dynaring, so I don't know why the Honda's EXP wouldn't work in the gasser.
If you can find a Dynaring for an 02-08 (to be safe) CRF450R, here is a video of the install and adjustment. Saw one on Craig's a while back. But I'm not sure if the GasGas clutch baskets are the same from your year to mine. Gofasters would know for sure.
http://www.youtube.com/watch?v=LsqKrh8fmZk
Here it is in action
http://www.youtube.com/watch?v=VXHHjnhIU3U
don't give up the autoclutch is worth it