We only got the V6 ones down here, I hate to think how slow the 4s would be.
Are there no wreckers in your area with Ford parts? surly you might be able to find one willing to swap. You could always try Ford, but I hate to think how much they would charge for a new ECU.
Otherwise have a look in the Probe forum here at AF.
I dont know how busy it is, or ifs even ever been posted in, but its worth a try.