As you know, S Voice from SGS III isn`t working on any other device because of checking device model. The bad solution is to mod your build.prop to make android think you are using SGS III, but it can cause incorrect work in some apps.
What I have Done
I have decompiled SVoice.apk, changed all checkings of device model to make app think it is SGS III, built and signed new apk.
So now all you have to do is:
1. Delete old S Voice
2. Revert your build.prop to stock, if you have modded it
3. Install new apk (as usual app) from Google Drive or Mediafire
Few actions aren`t working because of the incompatibility with some SGS III features.
Shortly, some apps or actions are not opening because S Voice can`t find Samsung`s Clock/Calendar/etc. It can be fixed only if these apps are ported to our devices.
Tested on my AOKP Galaxy S I with SGS III Addon (http://forum.xda-developers.com/show....php?t=1669190)
Please, test it on other devices and write me, if app doesn`t work