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Make a few and put them up for sale. Then you’ll know if it’s worthwhile pursuing - and work out where this leads. Others have beaten this path before, including some here on IIS.
One aspect is that I’d suggest don’t bother with configurations people can buy from say GSO - the point being you can make something that isn’t a standard commercial production item.
If you’re going to offer any kind of warranty as to their accuracy you’d better be able test them properly, or you risk having them returned from people who do know how to test them. Ideally engrave a serial number on them, and use DPAC with a photo of the interferogram and the point spread function (ie image of an artificial star) - and linked to the serial number.
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