Yes, this is why I decided not to go with them. I like your other idea though to buy some higend earphones and just replace the cable with one that has microphone and the remote (volume controls included).
Any idea what good combo of earphones and cable with microphone/volume control would be?
99% of cables have so similar resistance that it's not audible at all, whether it cost 10$ or 1000$ so don't believe in fairy tales that one will sound better than the other. So any cable you find for your earphone will most likely do the job 100% right, only thing you need to worry about is it's stiffness (if it's stiff cable and it's not worn over the ear but straight down from earphone it will produce noise when it hits your clothes while walking for example)...
Also when you're buying an earphone, check if it has version with mic, for example much praised (especially for the price) RHA MA750 has it's "i" version MA750i with the mic. And check with manufacturer if they sell cable with mic themselves, since that is probably the safest bet.
Also due to your budget note that cables with mic rarely go under 20-30$, usually even more, so that can add over 10% to the price of the earphones, which might not be worth it sometimes...
Can't be much of a help here I'm afraid... :/