This falls squarely in the category of nerdy waste of time, but I just whipped up an anglo-saxon futhoric keymap (for US PC keyboards) for X11/linux. Get it here, save it under “/etc/X11/xkb/symbols/pc” or the equivalent dir on your box. Then, add “en_futhark Old English Futhark” under the layout section in /etc/X11/xkb/rules/xfree86.lst or the equivalent file blah blah. Windows users, simply d/l and install the right file from here. Note that my keyboard is almost identical to their Runic_AS.