This is actually a really clever approach; I hadn't considered querying the Ekos engine "just-in-time" via API after launching the script to get parameters from it. The timing might be a bit tricky; you'd need to set it up as a pre-capture script and have it fork so control returns from the script, then wait a short amount for the exposure to start and then query the value, then ensure the script finishes at approximately the same time as the fake main exposure, but with a bit of tweaking this would likely do the trick.

I'm not currently using the RTS trick described in this post as I've switched over to a camera with proper driver support so I can plate solve, but if I end up running my old camera piggyback for widefield exposures on the same mount then this approach should let me synchronize exposures between the two units with minimal additional configuration. Thanks for the great idea!

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