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You don't need locals to participate if you control the central tabulating machines. They send in legit numbers and the numbers get skewed at the central point.
You don't need locals to participate when you have secretaries of state making partisan decisions like "I won't count any votes that come in after 5:00" or "Registrations have to be on one type of paper" or "We'll count these registrations but not those".
You don't need locals to participate when the states decide to implement touchscreen voting without paper backup and mandate it across all counties.
You don't need locals to participate in something evil when all they're doing is trying to avoid an expensive recount. You just give them the means and they do the work for you.
You don't need a lot of locals to disenfranchise thousands when you have someone mid level deciding how to allocate voting machines. The locals were yelling there weren't enough machines. They were calling the BOE when the machines failed to work and getting no answer.
We're not dummies. We vote locally and we understand how it works. But the old women who man the polling places around here have no idea what's up with voting machines. They can't control anything. If some dude in a jumpsuit with a name patch shows up, they give him the keys. Literally people could walk into these places with some "official" paperwork and wreak havoc.
And your statement still does not address what's to be done with sec's of state who subvert the spirit (and often letter) of the law to keep people from voting.
It doesn't have to be a widespread conspiracy. All it takes is a very true believers (like Noe's wife - the man is going to jail! and Wally O'Dell) and some people who demand "proof" or won't believe anything could possibly be happening.