Your hands grow from the right place, that's for sure. Since you're doing everything by yourself, Why wouldn't you pick up a black color cable, connectors and some angled jack? Do you know how to map correctly 4-8 strands balanced cable to unbalanced iems ? I have some fixed wired jvc fx 750 which I'd like to turn into balanced 2.5 with 8 strands black cable, preferably with removable connectors. I can't find this info anywhere.
Making a black 8 strands balanced cable with right angled plug is fairly easy - trying to take apart FX750 for recabling will be significantly more challenging, even for just a straight cable swap due to the combination of wood and brass housing. Not to mention the original cable exit / strain relief is likely too small to accommodate even a 4 strands configuration. Trying to put a MMCX connector onto the housing might also end up cracking the wooden outer shell. The safest way of converting FX750 is to cut off the cable a inch or two below the housing and put a MMCX socket there.