my paranoia (which is pretty high level as it is!) is more about malware that makes its way onto the thumb drive i use to transfer/broadcast transactions.
YES, I get those same exact fears in the back of my mind. One thing I want to try is to transfer data over an airgap via just a dumb QR code reader. Show QR on one screen, offline computer photographs it (with an offline camera peripheral) and decodes it, and then we could send information back to the online computer in the same way.