LTC1043 - Dual Precision Instrumentation Switched Capacitor Building Block

http://cds.linear.com/docs/en/datasheet/1043fa.pdf

It looks like this chip, though not intended for my application, could be used. I would like to increase the capacitance over their example, but it should work alright. I'll hopefully get to try it out in LTspice in the next few days. Sadly, the current-carrying ability is pretty weak, because it's intended as a filter feeding a high-impedance (opamp) input. 

It comes in a DIP-18 and SO-18 package, so great for prototyping and a future PCB. 

There is even a micropower version, LTC6943, that has less convenient packaging for a prototype but lower bias current.