You must have got good reason for wanting ICS rather than Jelly Bean, but with demise of forum.nitdroid I don't know where you are going to find hack for ICS. Here is image uponJelly Bean on N9 64GB

Incidentally have you found Google Play automatically updating to 7.7.31.0-all and then stopping in ICS? As a temporary fix to grab an application, you can always downgrade to an earlier version using previous version choices in Aptoide app., however it will quickly stop due to upgrading in the background to latest version.