I would patch the entire 8 conductor cable through and do the splitting outside of the faceplate/jack, since it seems as though it may change in the future. If you rewire it all for 2, 4 conductor jacks and put on new faceplates, you may be doing three times the work you need to.

Create an 8 conductor end, that takes pins 1/2 + 4/5 to a 4 conductor jack and pins 3/6 + 7/8 to a 4 conductor jack.

I'll post a picture link in a bit, to show you what i'm referring to.

- Tony
Ohio Data LLC
Phone systems, data networks, firewalls and servers in Central Ohio.
Some people aren't used to an environment where excellence is expected.