I'm pretty happy with where they're at now, they're not perfect for every song but they are pretty dang close.
Only reason I would want to upgrade would be for something with better technical qualities like separation or clarity. That's not to say that they are bad at that, it's more just me wondering what's out there.
Alternatively you can buy a replacement cable that way you don't have a large adapter that could become cumbersome, although it would be more expensive than an adapter. Decent cables go for about $20, I recommend Tripowin brand. Just make sure that it is MMCX to 2.5mm or 3.5mm. Be aware that 3.5mm will not be balanced but will still work with the Qudelix