However, I guess, once you buy any musical instrument it's yours to do what you want with it.
Confession, posts like this make me feel guilty as i changed the electronics in my Europa once with some non-alembic filter based electronics trying to get a poor man's series II.
I think i gigged with it about 2 or 3 times and though it sounded fine, there was something missing in the sound plus it had quite a bit of background noise, so i put the original electronics back in the bass confessed my sins here and vowed never to do that again.
Some years later, i managed to acquire a real series II. :-)
Over the years I have been on this forum we have seen a number of alembic instruments with non stock pickups and/or electronics, even a series guitar.
In fact there is a black spoiler on ebay as we speak with "upgrade" to Bartonini pickups.