General :: Sync SMS Between Multiple Phones And Tablets?

I'm using multiple android devices, all of them under one phone number (only one plan that includes five separate sim cards). All of the services are available under any individual device, BUT! Text messages (SMS) ONLY arrive at the devices that holds the "primary" or "master" sim card.

What I'd like to have, is the ability to somehow send any arriving messages from the primary device via something (email? im?) that doesn't require them to be in close vicinity (so no wlan/bluetooth). So that it wouldn't matter which device I hold, I'd always receive any incoming text messages and they would be available on all devices. Best would be, if also SENT messages would sync between devices.

Also of note is that the sync should be (almost) instantaneous (as fast as can be achieved via push-gmail or instant messaging). So no scheduled syncs or anything that requires an interval.

Each one of the devices are capable of sending/receiving sms on their own, so no technical barriers exist on that front.

By syncing, I mean that the messages would be available at each device's own "messaging system", NOT just backed up in email or something. (so SMS2Mail of backupsms -style apps are out of the question.)

The devices are running Android 2.2, 2.3, 3.1 and come next year, android 4.0.

I'm going to use:
* Samsung Galaxy Note
* Samsung Galaxy Tab
* Samsung Galaxy Tab 8.9
* Samsung Galaxy Gio
* Motorola Defy

I've looked into TotalSMS Control, DeskSMS, Phone Control and various other apps, but they all lack some part of what I need. (DeskSMS looked the most promising, but apparently doesn't work on Honeycomb, at least market doesn't show DeskSMS for my Tab 8.9).