Even if you went a scrubbed his computer of any electronic file and had him burn every paper copy he had it would still be futile.

electronic deposit using Zelle or direct bank account.

However in this electronic age maybe that does not have the impact it used to. 

For purposes of this Act, "'[c]ommerical solicitation'" means contact by telephone, mail, or electronic mail for the purpose of selling or marketing a consumer product or service. ... ." 

I know there are many (including Airbnb/short term rentals) that use strictly electronic locks, some of which don't even have a mechanical key or any kind of backup.

They post your rental ad on several sites, do background checks, and your tenants can pay you electronically thru that site with no fees to either of you.

Is there an electronic ignition switch that can replace the standard pilot to help cure the out pilot problem?

I use Cozy but Zillow now offers similar electronic rent collection options.

If this is completely eliminated, this will be much tougher to handle missed or late rent, calling handymen, etc.Rent is paid electronically and this should be okay just using email but curious if anyone has dealt with this issue, or any general advice for me.

It's so common that the California Association of Realtors actually created a separate disclosure form for it (Wire Fraud and Electronic Funds Transfer Advisory).Usually when I hear of this scam it's the escrow/title officer's email that's being hacked since that's where the wiring instructions would normally come from.