Maybe this is slightly off-topic since you are looking for analog output but the reference input of SD converters can float (above ground).
So, you can use the voltage across the bridge as the reference which makes everything nicely ratiometric.
As a bonus, you can also measure resistance variation of the bridge itself which might be useful for temperature drift compensation, e.g. in silicon strain gauges.
Refering to the attached schematic: Measuring VR2 (versus GND, single-ended) gives ratio of bridge resistance (perhaps temperature dependant) to some temperature stable resistance R2.
Using the bridge itself to measure temperature provides better compensation than using some external temperature sensor (PRT or whatever), particularly when temperature is changing (no thermal lag).
R1 helps with keeping in the common mode range of the input diff amp.
If you add capacitors for filtering, keep the time constants on the measurand and the reference roughly the same.
So, no accurate voltage references required.
