You can go about it two different ways. Cut out an opening for an IEC jack or put in another captive PC.
I've done both styles & they took about the same amount of work, as I had to enlarge the opening for a bigger strain relief when going to a bigger captive. With this particular captive, I also had to enlarge the holes in the circuit board, so the first thing you should do is take off the cover & see what's involved.
The benefit of the IEC jack is you can experiment w/other PC's.