I don’t think you need to do the fingerprint scan kiosk for an I-I transit... I think that’s a China entry thing.

I don’t recall seeing MU transit desks before the transfer area, but I had a through boarding pass so I wasn’t looking for them. The automated international transit gates do require a boarding pass for scanning, but there is a human-attended line to the side of the bank of gates and I don’t know if the same requirement applies there. They do seem to have a lot of DL and MU staff meeting arrivals in the sterile corridor (especially flagging tight connections) so one of them should be able to assist you.