Idun 387
Idun 387 is the APL387 font with runes drawn at the APL codepoints. An ordinary APL file shown in Idun 387 reads as Idun, while the file itself stays plain APL. The font also has the whole Runic block, so real rune files look the same.
The runes come from Noto Sans Runic, scaled to APL387's capital height and centred in its monospace cell. Every other glyph is APL387's, unchanged.
Licence
The font is a derivative of Noto Sans Runic (SIL Open Font License 1.1, © The Noto Project Authors) and APL387 (public domain, by Adám Brudzewsky), so it is released under the OFL 1.1. The code that builds it, and the rest of Idun, is MIT.