McC can endorse S. S and McC can both call on S to resign as Lt.-Gov. when he loses the replacement election. If B resigns, S appoints McC as Lt.-Gov. If B refuses to resign, new Gov. S moves him to a new "office" in the executive washroom, and by executive order gives all the functions that the Lt-Gov. would otherwise perform, to McC in the Lt.-Gov's office.
I happen to know that exactly this proposal went into the S and McC camps through a mutually trusted intermediary, three weeks ago.
John / Billybob
No wonder "political cynicism" is a prevailing factor in elections anymore! l