ᚹᛖᛋᚪᚦ ᚷᛖ ᚻᚪᛚᛖ ᛠᛚᛚᛖ!
I made it just now in Ukelele in an attempt to take my mind off my migraine (it didn't work)
It's an absolutely barebones keyboard layout built on top of US Extended, you could consider it to be version 0.1. It does not use a shift row or alt row. everything fits on the keyboard.
This layout is designed exclusively for my use writing in Anglo-Saxon. It contains all the letters of the Anglo-Saxon fuþorc (not the elder fuþark, which is a little different) from the runic poem, leaving out ᛄ as it was seldom actually used in epigraphs in spite of the later manuscript attestations, instead ᛡ was used as ger so this is used instead.
All is þwerty with additional runes added in place of ; ' and roman characters that have no use in Old English.
If you can't see the runes in my post you should download junicode.
I'd love to make this for windows but I don't own the operating system and I don't know how to make a keyboard layout for windows.