Honestly a floppy drive that you only connect to the raspi to transfer stuff is the only secure-ish way I can think of transferring data to your non-networked c

Honestly a floppy drive that you only connect to the raspi to transfer stuff is the only secure-ish way I can think of transferring data to your non-networked computer. Floppies are nice and dumb. If you want a persistent, networked connection then just use a serial cable, but then... you're not airgapped anymore.