Actually, you’d just stage a Covid vax reaction (heart attack) with Harris either passing or in serious health jeopardy....just like the several hundred each day that have heart ailments from the vax (all believable now).
If CNN or Fox throw the vax reaction story out there....more than 90-percent of people (even on FreeRepublic) would believe the ailment story, and never suggest some rogue group constructed the event.
The Speaker of the House would become the president.