You have a few options available to you, what you are thinking about is possible, but not the only option
Option 1
- use xlights from Dan's site - http://dankulp.com/xlights/?C=M;O=D
- sequence away on the mac
- save resulting xml/mp3/xseq files on a usb key
- move over to Windows PC and open the xml/mp3/xseq files and set up your schedule and run
Option 2
- load up bootcamp, install xlights on the windows bootcamp, sequence and schedule from there
Option 3
- sequence on the mac
- run the show from a raspberry pi
Option 4 (

)
- sequence on the mac
- install some linux OS on the windows PC, install FPP and run the show that way