A lot of the reason to use PT100 to begin with is that when the measurement circuit is good, you don't need a lookup table to get 0.1degC resolution.
Lookup calibration is tedious to do and error-prone, so it's a huge plus to avoid doing that. Plus, you'd need a reliable reference temperature for the whole range. For that, you at least need an already calibrated, high accuracy thermometer which you can calibrate your own against.
If you really are ready to do a complete lookup calibration anyway, maybe you indeed could use a cheaper, simpler NTC thermistor with the very simple resistor divider circuit. NTC has a steep curve, meaning you get a lot more change of resistance in your temperature range. With a lookup table based calibration over the full intended operating range, 0.1degC accuracy is IMHO possible.