I agree wholeheartedly with igadget. With these Breakout Modules, you can run your Cat 5e to each of those drops, but terminate at the TC (Telephone Closet) on a standard Cat 5e Patch Panel (which you're already skilled at).

Then simply patch in the 16 ports to the ports on the 47609's (you'll need 4 of them).

At the Workstation end, install your dual-6pos/4pin jacks for those woeful 4-line POTS sets, so at least the TC end is set up for the inevitable upgrade. Then, you only have to rewire the Workstation end and plug in a VoIP System at the TC.

That is, when the infamous OWNER comes to his senses...

Nihil est--in vita priore ego imperator Romanus fui.
That's nothing--in a previous life I was a Roman Emperor!