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I can't see the problem with getting a commodity 14" or 16" fork mounted SCT and accepting that the mount will not last forever. The amortised price would undoubtably beat any solution using something really designed for photography.
The OTA may well be saleable when the mount has to go. When that happens they'll get better electronics with whatever they buy to replace it. As long as they keep spares on hand, the time to upgrade is when the spares run short - not when they run out.
From the few outreach nights I've been to - with better skies than you'll ever get in the CBD - what customers want is to look through an eyepiece attached to some largish scope. Something on a screen keeps them interested while they wait, but that is not why they came and paid their money.
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