The designs for the first modules just shipped to OSH Park and parts are on order from Digikey!
The more I thought about these modules, the simpler they got - at least these first versions. The ADA2200 break out just has that device, a few decoupling caps, and an output filter. Modules were designed for the two noise sources - basically just copying the designs given in the articles. The final module is just a break-out for a dual, single-supply opamp. There are several suitable opamps that could be used including TS922, LMV772, OPA2376, and ADA4528-2. Spend as much or as little as you like! Using this break-out, it should be possible to build filters, summers, and level shifters as needed on a breadboard.
Another module that I'm eager to create is a programmable gain amplifier. I have some circuits to look at that will provide guidance, but I wanted to get these first modules built so experimentation can begin. PDFs of the schematics are in the Files section (or soon will be). KiCAD files are available if anyone wants them.