I posted this on Reddit too in of the posts related to this, but thought it might be useful here too. But I'm glad there is a fix coming! So this might not be necessary even.

TLDR - Please try messing about with sample rates and WASAPI mode on Windows to see if it helps.

On Linux I fixed this with

winetricks -q sound=alsa

At first I suspected something to do with Pulseaudio in Wine and Linuxy things, but reading so many Windows users also having the issue the fault could lie elsewhere. By bypassing Pulseaudio and software resampling, the crackling stopped. I wonder if setting a global sample rate at 16-bit 44.1 khz on Windows would also fix it...if that's the sample rate that FFXIV uses? And WASAPI exclusive mode, because then there would be no resampling utilising CPU and messing about with things.

Anyways, I'm super happy the crackling and popping went away. It was driving me nuts.