Andy,
This thread is dealing with the Enhanced Search Widget and not the OTB Search Widget. But to answer your question what you are attempting can not be done with out writing code to handle the Query of two specific REST endpoints and then more code to handle displaying the results of both querys.
Chris,
Seems like you sent me the wrong file (right name and all), but this one is unaltered from the original that is included in the download and does not contain any of your changes.
Jon,
You simply forgot to change the <floatorfixed>fixed</floatorfixed> to float.