Crikey, all getting a bit militant here...
By all means file whatever you want to file. I really do get your wish to access/transit controlled airspace safely. Realistically you know when the airspace is busy though and ought to expect a delay if you want a safe transit (or route around). Fast jets, even some of the faster turboprops versus relatively slow props/helis is not a great mix on conflicting tracks. It's about your safety too after all.
Yes ATC likes to "push tin", but they like doing it safely.