...the cable is a bit too long for having my iPod in my pocket comfortably
That's the only (potential) downside of having a fixed cable.
Once out of warranty you
could shorten the cable and use an extension when you needed it longer - though the coiled cable might make that less practical than with a straight one.
Depends how easy it is to get inside the earcup - but it looks like the design would lend itself well to being modified with a mini-XLR or 3.5mm socket in the cable entry position.
That would allow a choice of swappable cable lengths.
(And, as part of such a mod, you could easily be left with a genuinely balanced use option - for the future).
Meantime, enjoy it as it is 👍