hmmm, I am now on the road or in various hotels for about a week. I wonder if I can write up some sort of usb to SIM bit-bangy interface with a little digispark(attiny85) and some snipped paperclips for contacts; not sure I have anything along to do that.
I will probably read the vcard fies and just plug them in by hand.
I had forgotten the N900 could even read from a SIM, was dissapointed we never got write working.