Depends, not if it is the sidestand switch that's causing the problem (and it sounds like it's got to be), an mc21 will not run in gear with the sidestand down, full stop.

Try earthing that wire instead, that's the two states it can be in, earthed or not, there is no power at the sidestand switch.
I'd presumed it earthed it when the stand was up, maybe not.
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