I'd first look at downloading a froyo rom like Harmonia or Bumblebee and extract it and go to the folder system/app within the extracted rom and try using the Phone.apk. I'm not 100% sure this will work but its worth a shot.
Ok, try these. I make no guarantees that the dialer package from Harmonia will work. (But I think you know that )
I assume you have a good nand, but if you don't, make one.
Hope this works for ya. The MIUIHO one will return your original dialer package.
I gave it a shot. Didn't work. After booting, as soon as I unlocked the phone I got a forceclose loop. So I just restored from my fresh nandroid and I'm back up. Bummer. I was hoping that would do the trick.
Sent via VM670