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<...and then sandwich the whole thing... I'm just wondering if it might affect the sound quality of the pickup and how? Would it even work at all?
Is that piezo from AllElectronics.com? The transducer is pretty tough, if you wanted to you could just use scissors to cut inside the plastic and it will still be usable. If you cut a piezo disk in half both sides will still work.
If the plastic ring is glued all the way around it might be too difficult to remove and still have a flat disk. I like your small round pieces of wood idea.
I'm a big fan of encasing the piezo and attaching with thick foam double side tape, or embedding the disk in the bridge.
You could just put out a big blob of hot glue and stick it in that then cover it up with more.
Have you experimented with it the way it is? If it was me I'd see if there were advantages to mounting it on an outer ring with a little air and plastic between the vibrating soundboard and the element. Try it.
Here are some sources for naked piezos next time you stock up:
And if you can solder stainless steel these are insane