I would be very surprised if this worked to get you Pre-Check.
It will absolutely not work. You have to be registered for it through your FF program and then the TSA decides whether you qualify or not. Either way it is encoded in your boarding pass. I have used precheck with AA and UA and I'd say 90% of the time I get the three beeps. VA is not participating yet, so there is absolutely no way to use precheck on a VA flight.