ie. is it possible or not to have a 320x240 spot (non-radiometric) cam?
Yes - you can take any thermal camera and align it with a conventional spot thermometer.
Argus 2 and Argus 3 were just such because the BST core could not measure temperature.
These days though, I do not see why anyone would bother. The unit cost trade off is a decent shutter and a thermistor versus the spot device and alignment hassles.
However, as you are finding out, cost and selling price are almost independent especially with FLIR.
If it does more - charge more anyway and
hope market it so most people do not buy the bottom model which is likely quite close to cost price.
A non-radiometruic camera might be preferable if you object massively to FFC shutter events and could reduce/remove the FFC period without causing a bad image due to column drifts. In a way this is where the shutterless camera systems sit.