I'd get an RJ45 socket with a metal shield, that can be soldered to. Drill out the board (eg a pilot hole filed to make it rectangular) to leave a space for the pins to poke through without touching anything. Solder the shield to the copper traces (with enlarged holes if necessary) so that it's mechanically secure. Then run short wires from each pin to the relevant copper track. Once it's electrically OK and mechanically secure, fill in the hole with epoxy to stop anything snapping later.
Theo