I am assuming that the Cipher cable is the same between the el8 Ti and the Sine; it wouldn't make much sense to do two different DAC/amp/DSP cables and name them the same.
Y'all are welcome to use my Cipher into your EL-8's, and I feel sure they would work. There will be some kludgery involved, mechanically, since the terminations at the earcups are different between EL-8 and Sine.
The Audeze iOS app, as Timelord noted, is a 10 band equalizer, and you can set your own 2 curves (and adjust them on the fly too). I keep one flat, and one customized, so I can instantly compare the sound with one tap on the screen.