Are resistor networks appropriate for voltage divider?
Ask a product rep to clarify, if these dividers can be cascaded.
https://www.maximintegrated.com/en/products/analog/data-converters/digital-potentiometers/MAX5490.html; and then use precision reference + buffer to create the voltage that will be divided down.
Also, you need opamp buffers; cannot connect individual references directly to sensor reference pin.
Explore putting separate (or multiple banks of) voltage references if it is a high precision application. I doubt that you would want to do so as you need quite a few.



  I was tempted to use a 10K resistor network to individually ground
  the inputs but then I wondered whether this would in any way affect
  the sensitivity of the measurements or generate interferences between
  channels


A schematic would explain this clause better.

I hope it helps.