I decided to give the Virutex Stair Template a try, I ordered them from Virutex US website; which no longer lists them for some reason.
They are essentially the same as MFS 200, 400, and 700 profiles.
Same 16mm thickness and 80mm width.
The interal webs of the extrusions are slightly different.
The end track alignment features are different, the Virutex mills a tenion in the end and Festool uses installed round plugs.
The Festool MFS extrusions will attach to the Virutex PFP extrusions.
And visa versa.
But they do look like a perfect alternative if you decided to purchase rather than make your own.