Hi Limi,
First of all, thanks to you and the team for the great Amiga.Vision.
One small remark: I have read on the GitHub that currently there is no tool to format in PFS3. Actually, there is one nice Windows/Mac/Linux tool that is able to both format in PFS3 and copy the files. You may want to give it a try: https://github.com/henrikstengaard/hst-imager