Hello. A bit on PC drives:
PC drives normally comes prepared to work as DS1 (B), so if you want they to work as DS0 (A) you must modify them or alternatively interchange DS0 and DS1 at the cable (the twist you can see in the PC cables is for this unit selection, instead unit modification).
You can’t have two DS0 or DS1 units on the same cable, because they interfere each other. On the PCW it’s the units that comes prepared to recognise the signal DSx, so you can modify them or interchange the signals.
Take care on boot, though. PCW only boots from A, and you must use a 720 KB image, not a converted 180 one. Some boot games (like Opera ones) work if written in single step (the bootloader always do single steps), but CP/M won’t work because once the CP/M loader has done his job and the CP/M gets started, the BIOS detect a 720 drive with a 180 disk, so it attempts to read it using double steps (and also only one side, but that’s not the point).
Said all this, the PCW works perfectly with a Gotek drive; unlike the CPC, it’s always in "IBM mode" (sectors starting in $01 instead of $41 or $C1), and also using 9 sectors instead of 8 (like a real PC). I recommend the READY modification as some software expect it.
Regards.