I don't understand what you're trying to do. There is almost nothing I know of that has a 3.5mm balanced plug. Not saying there isn't something, but it's not at all common. Balanced is usually 2.5, with some new stuff now with 4.4.
If you're getting a new cable, why not get the right termination for your use?
Hifiman and LH Labs use 3.5mm balanced output but you're right they're not very common. Especially not on newer equipment.
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