> I want to remap an ordinary letter key to another ordinary letter key. Regular...

kps on Oct 3, 2016 | parent | context | favorite | on: Karabiner – Easy Keyboard Remapping for OS X

  > I want to remap an ordinary letter key to another ordinary letter key.

Regular keys should probably be mapped with a regular keyboard layout, unless 10.12 screwed that up too. See Ukelele (sic) http://www.sil.org/resources/software_fonts/ukelele or just copy and edit a .keylayout file.