But its possible to all fit this with 3knob total ? Will i lose my passive/active pull off ? ANd is it better to change electronics or pups ?
Been there and done all that. First, ask yourself the question RFord04 posed: What don't you like about the current preamp and what do you want instead?
If you decide you want another preamp, then you need to decide what you are looking for and whether you can meet your space needs with available holes. Most preamps can accommodate stacked controls, so your options are broad (3 holes = 6 knobs), plus pill switches can often be added to stacked pots.
I've put together a pretty fair number of preamp mods this way, but one of the fundamental questions that often doesn't get asked is: Do I really want another bass instead of the one I'm modding? More times than not, there's more to gain by trying out other instruments than by torturing one that can't easily be what it's not.