To bypass the sidestand cut out completely, you need to
1- Connect all 3 wires in the sidestand switch pigtail together and solder them. Just twisting them can result in crap connections.
2- Connect both wires in the clutch switch together in the same way.
My C10 has been like this for 10+ years.
Get used to occasionally scraping the sidestand as you pull away. <LOL>
If the cause is in your J-Box, then here is Guy Youngs better wiring diagram for the J-Box/C10, so you can diagnose it.