It may be possible under dire circumstances but no matter how important of a schedule they may have, They should be attending the interview, My best guess is that the whole interview would be rescheduled for both you and the beneficiary.
It can take months to get a rescheduled interview date so I would strongly suggest that you keep the current date.
You must contact the Embassy before the interview date and they'll most likely reschedule the interview for both you and the beneficiary.
I have a few questions of my own, How much time did it take you to get the IL after moving your case to Malaysia? I myself haven't gone through the interview but 2 of my cousins recently got interviewed for EB-3 and shared their experience with me.