all 3.5" drives are either hard wired to DSK2. or are jumperable 1 or 2.. you can use a special hand made cable or switch838's switchbox to set the drive number manually on the cable.
you can use either a 800k or 1.44 drive in 800k mode but you will only get 40 track/dsdd off either of them.. if you are using HD disks on the 1.44 cover the hd hole with opaque tape so it switches to DS/DD mode.. these are both 80 track drives
flashfloppy flashed gotek just uses dsk files on a fat32 disk, should be just as easy as a pc on a mac I have preflashed modded goteks in stock if you need one or all the info is at flashfloppy's github https://github.com/keirf/flashfloppy