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Colin is correct - its unlikely that you will be able to accurately quantify seeing (FWHM) that is under the image scale, much better to be slightly over sampled.
So probably better to have an image scale of lets say 0.5 to 0.7 arcsec/pix
Some larger stars are likely to be spread across multiple pixels so you would potentially get some insight but its not ideal, and these arent typically the stars you would choose to use anyway.
2x converter maybe ? - trouble is that might introduce further aberration into your imaging system which will simply inflate the real FWHM you are trying to measure - Catch22
And who knows maybe the site is capable of sub arc second seeing at times !
But light gradients from the two nearby major cities will be a constraint for lower alt, wide field imaging.
Just take a 360 degree panorama of long exposures with a wide angle lens and see what you get, but under 25kms from a couple of 40,000+ population cities will produce quite a glow !
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