OLP MM2 - Is this a good idea?

[grumpyguts]

I have recently acquired one of these with the intention of having some fun with mods. It is clear there are various options regarding better pup and adding a pre-amp.

However my thoughts are heading towards adding another MM pickup around 2 inches behind the neck. Is this a bonkers idea? My intention would be to wire the existing pickup to the rear volume pot leaving the front pot available for the neck pup.

If I buy a SBM4A can this be used passive?

[blablas]

The SBM4A is a passive pickup, doesn't need a battery.