There is no problem with deleting the PPOS and having the FAP as the FROM waypoint. I do it on most on my flights, and it works out just fine.
Once you pass the marker/intermediate fix the runway will be TO, and the marker/intermediate fix the FROM waypoint, and everything is as it should be.
And yes, even RNAV approaches can be flown like that, the Airbus intercepts those even before the FAF.