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3.7 or so micron pixels seem to be about the most common size in a lot of the CMOS sensors so it is going to be hard to get away from. That said, the (Not Sony) sensor in the ASI1600 seems to be a pretty sensitive thing and that has the same pixel size.
3.8 ish seems to be a reasonably flexible size, on the likes of an SCT you would be a little oversampled but binned 2X2 you would be reasonably well sampled. Pair it up with around 400mm focal length and it is in the typical "well" sampled range where my ASI294 os unedrsampled and I use heaps of subs and drizzle processing to try to recover more detail.
Binning a CMOS does not provide the read noise advantage that it does on a CCD (Four pixels read as a single pixel in a CCD, so one sample of read noise, versus four pixels read once each and combined in software for a CMOS) but it does not really seem to have great drawbacks apart from paying for sensor resolution and not using it.
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