So, if the issue with Cliffjumper is one of licensing and deformation, I'll throw out a solution, however painful:
Release a retool of Bumblebee as an Audi TT. It looks reasonably close to an SD Porsche and it shares a chasis with the VW bug. It's certainly a better compromise than you'd get by making him a realistic Porsche.
It also comes in a model with a spoiler.
And we have had non-G1 MP releases, right?
The MPMs and soon to be Primal.
So you do a Masterpiece Cliffjumper as an Audi TT.
And you call it Masterpiece Binaltech Cliff. You cheat as close as you can to G1 in robot mode. Masterpiece engineering. But use the Audi TT as the vehicle.