I tried kicking the clutch free one time, and found out that when it cleared, my knee tried to bend the wrong way. I do kick pretty hard I guess.
Anyway, I live on a hill so I start and warm up the bike in neutral, then get it rolling down the hill. It's easy to shift into first when rolling, and I hold the clutch in and blip the throttle a bit until the clutch spins free. I had to do that this morning, as I noticed threads showing on my R65's rear tire the other night, so I'm waiting for a new tire. 34 degrees was too cold to ride my Triumph 35 miles this morning, but I did it anyway.
Anyway, sorry for the digression. But if my R65 clutch stuck I would do the same thing with it. You don't have to be rolling very fast to get it into first without the clutch.