Making a four-on-the-tree, has anyone tried this?

we did this to a uk ford zephyr we fitted a later 4 speed to. we just made a small hole in the tunnel for a short rod to poke up through from the reverse lever, threaded it and screwed on a small ball shift knob. it barely sat higher than the carpet but pulled up to select reverse just fine. we made a small slit in the carpet so it could be put back to stock if needs be with a rubber grommet added to the hole in the tunnel.
neil.