jm z,¡!>üE!îÈMgÂeOç³0<¼ÊInâó5LOr make your own OP_RETURN hex and paste it into Electron Cash's custom OP_RETURN.. thing.
https://github.com/emergent-reasons/pycashaccount
https://whatsonchain.com/tx/7c5fd9c6ba14457b8219f99d927e5d020dc01e6d268a81a22e03a0050a8acaf5