To answer your question, "is this possible?" -- Yes.
But you want 5 pots on this thing, so you need to consider not only the wiring, but how it's all going to fit in whatever you're building- you didn't say what your custom bass is going to look like, but it had better have a big control cavity to fit all this in.
You'll probably be forced by space limits to use concentric pots and/or push/pull switched pots. For example, you could use a push/pull pot for your master vol, and use the switch for the active/passive switch. One concentric pot could handle the tone controls (except the midrange).
You may want to consider if you really need the 3-way onboard EQ. That feature alone adds considerable complexity to your scheme and you can always use your amp's EQ section. Even eliminating the midrange would make the project a lot simpler.
It looks like it will be pretty complicated. I'll tell full story of it...
I own Victor Bailey 5-string Jazz Bass. It's Active bass, with great active pups, but I want also passive circle. So I wanted to make new electronics to get what I need. There is done some upgrades, thats why I call it "custom bass".
Maybe there is some way how I can add passive circle to my current active.
Here is image of my bass. You can see that there is no plastic plate. The space for electronics is very big.
Maybe I can add passive circle, and put this push/pull on Volume knob...
Your first post made it sound like you were changing the pickups, but I see from the pictures that most of what you want is already in the guitar. You're hoping to keep the active pickups, but run a separate circuit bypassing the preamp, am I correct on that?
If that's what you want to do, someone else with more experience with active circuitry is going to have to chime in on this topic- I'm not sure if that's feasible. I believe that active pickups are wound so as to work better with the active preamp, they may not be well suited to being used passively.