Yammy
New Head-Fier
Just a note that the non-ConX EA cables might not work well. I only have the EA Grandioso in MMCX and although it fit my IE600/IE900, the connection was not really secure. I recently picked up this GuCraftsman cable (https://www.amazon.com/dp/B08S2Z82Z9?psc=1&ref=ppx_yo2ov_dt_b_product_details) and it snaps in securely. I've been using a GuCraftsman IPX cable on my UE Live for some time as well without any issues. I won't comment on any sonic changes as my main reason for picking up these cables are due to the limited availability of 4.4mm cables in IPX & Sennheiser MMCX terminations.
Looking at the GuCraftsman cable and it looks like the right type of design for the IE900. My other aftermarket MMCX cables have the "shoulder" of the connector recessed into a housing, most of which aren't easy to modify or cut around. The price looks decent enough to give it a shot.