Sharp and Simple Analog Filter suggestions
This might sound silly, but it could work and result in a simple circuit with large margins for errors: demodulate the signal to a lower frequency. 

By multiplying the signal with a ~750 tone, you will have a ~30Hz and ~250Hz signals, that can easily be separated with a first order filter. 

You can easily achieve this by “chopping” the signal with the output of a 750Hz astable  and a transistor or two, or even just with some diodes. You also need to low-pass it at ~400Hz to remove the images. 

A simpler alternative, because it would reuse circuits and concepts, would be to have two oscillators/demodulator/filter chains. One at ~750Hz the other at ~950Hz.  You just have to use stable capacitors for the oscillators, the rest can have very large tolerances. 

This design can easily be moved to any desired frequency, just by retuning the oscillators.