Replacing hard to reach bilge pump on S2 Sailboat

The 36 foot S2 center cockpit sailboat has a very hard to reach bilge area. It has an encapsulated keel which is good and bad. the last foot of the keel is hollow and about 3 feet deep. The bilge and float switch need to be on a piece of wood coated in epoxy fitted down in the hole, And the hole is directly under the engine. https://www.instagram.com/downintheislands/