The freedom plate is designed so that you can mount reactors on skis other than lines at the expense of having a riser. Other bindings you would mount directly on the ski. So whether or not you could drill other bindings into the freedom plate or not (NO), there would be no point anyway.
line skis (with the exception of the 07's) have 4-predrilled holes were the bindings are meant to be mounted. If you have line bindings they can mount to those 4 holes with any drilling made. But if you dont want line bindings it is JUST like mounting any other ski, just ignore the 4 holes/ pretend they are not there. Ihave the reactors and they are underrated. They definately arent the best but they dont suck as much as people say they do. I have had mine for for 2 years and have had no trouble. I would only get them if you have more then one Line ski. Like me.