Probably possible, but not worth it...
However mph has nothing to do with the info you need for picking the proper electric fan motor.
It is CFM flow. (It would need to flow atleast 260cfm for the Zetec to just break even at 6500rpm)
However in order to make an AC leaf blower run on 12VDC you would need a power inverter first.
I figure by the time you rigged everything up to try this experiment the added weight would easily negate the "possible" couple HP/TQ gains it would give you.
You could always try an E-Ram. It's compact, powerful and should make 1.5psi of boost on the Zetec.
Though for several hundred dollars it is about 3 times the cost outlay you were probably looking at.
The short answer - No.