How do add iota subscripts in Galaxie Greek?
From the information at https://help.keyman.com/keyboard/galaxie_greek_mnemonic/3.2.2/galaxie_greek_mnemonic, it seems that there are several keys (
¦ § ñ Ñ ) that enable the typing of the iota subscript. If you’re using a US English QWERTY keyboard, then probably
| is the easiest. (For a French keyboard,
§ might be easier.)
Write again if this doesn’t address your question.