Yes, and someone more paranoid than your paranoid would point you to Heads rather than Tails.
Is this suppose to be a play on words?
Their mistake was running SCADA using Windows and of course someone brought an usb stick one day...
What's SCADA and what does it have to do with the USB stick?
It doesn't need to be Tails, i see no point if the machine is not connected anyway; any distro would work.
But, Tails is a popular Linux OS that contains Electrum. Yeah, you could use another one such as Ubuntu, Debian etc., of course.