I've developed a small application that will hide or show your SIM Contacts from the Contacts Menu. To use it, just put it in your phone and run the application. It will modify the registry to show or hide your SIM Contacts (depending on the current setting)..
Example, if you Registry is configured to show SIM Contacts, then the registry will be modified to hide it.
If the current setting is hide, then it will be modified to show it.
Let me know if you need further information. Thanks!!
Added parameters :
/hide - hides the SIM Contacts
/show - Shows SIM Contacts.
Thanks to starbase64 for the suggestion