I get the feeling there's an interesting story behind this. Starting with: why Tails, if it's offline?
So my setup with the no wifi linux box is that I do a electrum transaction on one computer, then save it off and sign it on the second computer. The second computer is an air-gapped not on-line linux that boots tails via a usb. I use electrum on tails to sign anything. It is just a way to have air gapped box.