Charge Measurement for Piezoelectric Sensor
The charge amplifiers I have used before with accelerometers were sold with the sensors. But there seems to be generic charge amplifier instruments on the market. E.g. this. If you don't want to build a circuit, you can characterize your sensor with an instrument, and build the circuit after you determined the parameters.

Otherwise, if there is no budget for an instrument, I think the only solution is to build something adjustable yourself.