I actually ended up finding a somewhat acceptable solution to the problem. I programmed the extension that used to hit the bell on a 5224 key, then rerouted it to the paging unit extension. I then put a directed call pickup speed dial on the same phone, so they can hit the "bell" button to pick it up. It now rings through the paging system. They were less than thrilled with it, but since the paging is only in the warehouse where the bell was, it was an acceptable solution.
I'm with MIMB, when can I get away from the legacy copper and retire my 66 block blade? My current install is a campus environment, so I will end up with 5 per nodes spread over two 3300 MXe controllers just for faxes.
M1tel, thanks for the tip. I had suggested it to the customer before posting, but they aren't giving up any more cash.