Ok I found for me a quick and dirty solution to send an UCS2 sms at a specific time through conversation.

I am using alarmed to trigger smssend with option read sms from file and -c, also added function to call cnee after that and the mouse will automaticly push the send button.

In the scratchbox emulator I recorded the mouse movements.

cnee is a part of xnee.

It is sad that I don't have the knowledge to modify smssend for UCS2 support. I would maybe rewrite the app with pdu mode and not with text mode but since I found a way...