For anyone else with same interest, i.e., autofocusing on the Sun or Moon, I did find an INDI solution: CCDCiel. Installing it on the Raspberry Pi 4 I have running StellarMate OS, once I use the SM Web Manager to start indiserver with profile for my camera (Nikon D750) and focuser (DeepSkyDad AF3), I can connect with CCDCiel, set autofocus mode to Planets and then start Autofocus and it appears to do a pretty solid job of getting a sharp focus. CCDCiel has a lot of overlap with EKOS/KSTARS so not sure yet which I will end up using for imaging but even if I just use CCDCiel for solar/lunar autofocus, it'll be worth having.

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