I looked very closely at the various ICS (I have samples of all models) and, if someone had asked me, I would have (wrongly, obviously) said it was impossible to insert a card missing the uSD connector.
The good news is that the ICS can indeed be opened. There is a big "but" here, however. The unit was not designed or meant to be opened and you likely will be voiding your warranty in the process. As well, it is a very, very delicate operation (the "lid" is only ~1mm thick) and you could end up damaging the device. I have done this - but I did so on already-dead FC and SC units - so I don't know if I damaged them during the process. If you want to continue, don't blame me if something goes wrong...
Ok, with the fan opening facing upwards and the HDMI connector facing away from you, look closely at the opposite end. You should see a crack close to and running parallel to the top. You can pry open along this crack (I used an exacto knife) and then down both sides of the unit. You should not have to lift this end very far to access this errant uSD card. If you have to pry up more that half way along the unit (or if you want to remove this cover completely), be very careful of the fine gauge wires for the fan, as well as the connector tabs, at/near the opposite (HDMI connector) end.
Hope this helps,