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How it is done depends on the year. A good indy with the tech tools can shut many of them off. best route of some trikes is to use the relocate but again depends on the year of the bike.
You do not really shut the BAS off. When it is switched to trike mode or sidecar it tells BCM to look for a different source. If it does not find one it will disable the current one . But depending on year throw a harmless code. .
Many dealers will refuse to make the change for you.