Flowman
I fly a turboprop GA aircraft around UK and Europe IFR. Every flight usually takes multiple attempts to get a acc for the route or a call to help desk.
Why not accept our Plan first time and TELL us the route You require between our dep and dest with the acc ,easy, as most times we get airborne the route flown is different to the acc.
With modern GPS based nav last minute route changes are no problem.
Perhaps too radical a proposal!!