We used to have a running contest to see who could drive without using the clutch in an old ford crew cab. The winner was who could start, shift, back up, go forward and shift again without grinding the gears. This was in the bush up a logging road were you had to stop back up and go forward to make the corner.
I could never get it quite perfect, just as it was about to stall you slipped it in reverse, then the same in first and off you go.
So if you want to start it without the clutch, put it in first, turn the key and it starts, away you go.
Enough story time, I have to go look at yet another used bike.