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Could end up slightly weird and uncontrollable (a phase cancellation mess) but you never know... It sounds like something that would potentially mess with impedance of the piezos in a big way.
As you probably already know, the simplest option is to run two sets of Parallel wired piezos (humbucking) and then wire them in Series (ala a 4x12 speaker cabinet wiring), use just one preamp, then move the piezos around to find the sweet-spots and avoid phase cancellation issues.
If you intend to mix them, you could give them each their preamp and mix the signal post preamp, maybe with a summing amp/buffer at the end. A bit overkill and over-engineered though...
You could wire two piezos in a humbucking configuration and get away with 2 preamps rather than 4.
You could then put two at the bridge and two at the neck with a blend pot to sum them.
This could allow for some interesting variations in sound, specially with a phase reverse switch on one of the channels. This could be quite handy if you intend to use the guitar mainly for studio recording as it allows to place the guitar quite nicely in the mix, by blending the two sets in order to make it "pop out" in the mix.
Another option would to give each piezo their own JFet buffer with a trimpot at each buffer output, before going in to the main preamp. That is the method that allows for most control (at least in my mind)
The various piezos will not interfere with each other when done this way.
There are many ways to do it, but adding the trimpot as a volume for the piezo before it enters the preamp does not sound like the way to go. But please try it and see if I'm wrong... It could still sound cool... You never know before you try it...
But here is a question: if they are all placed under the bridge... Why would there be a need to mix them?
They should pretty much have the same phase and pretty much the same sound according to my logic... There would not be much variation to be gained compared to having one at the bridge and one at the neck.
Hope this helps, and please let us know what you find, if you choose to experiment with various solutions. I might want to copy your findings, as I've been quite curious about that preamp and have a lot of piezos lying around...
Remember that there are no rules in this game. Most cool stuff happens by doing things wrong!
You can not do much harm at low voltages. Do crazy shit and see what happens! Let the magic smoke out!
Cheers!
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