I've found two commercially available baseplates for my car. Both are pushing $400 before taxes, shipping or installation.
Now, I find out that while the car is flat tow-able, the odometer is going to tick because the ignition must be on while the car is towed. The neutral sprawl is electrically powered and the CV joints are sealed.
With $400 for a baseplate, $200 for installation ($100 in tools if I do it myself), and another $100+ for a towbar, $50 for safety cables, and another $50 for a light kit, I come up with a total of $800+ to get the car flat tow-able.
For ~$800, I can get a used dolly in good condition, like
this.
Unless someone tells me that a custom baseplate is cheaper, I think the dolly will be my tow method.
Russ