I second Dicko's reply. I would leave the BM as is and use an external pump.
Just thinking out loud:
1) Add
a BrauTim-style dip tube/hop filter2) Modify the spigot to add an easier connection for the pump (e.g.
as shown by Batz)
3) Use the pump with a plate chiller connected to the spigot
I personally use a immersion chiller. A few days before brewing I fill a few ice cream boxes with water and put them in the freezer. I have a Curver box filled with water in which I add those big ice cubes during the last 15 minutes of the boil. This chills the water to about 4~5°C. When chilling I start with the chiller connected to the tap until I reach about 20~25°C (depending on the season) and then I switch it over to a fountain pump I put in the Curver box. I recirculate the "ice water" because otherwise the box will be empty in no time. Simple let the "warm" water run off onto the ice cube(s) which will chill it instantly. I can easily chill my wort to 16~17°C (and probably lower if I would be doing a lager).
Niels