Funny... lol
But it is possible to do it easily in Pixinsight, even with photometricaly colored synthetic stars.
Just create star chart (there is a script for this) and you even can create colored one (by selecting photometric filters of catalog then generate 3 charts you will assemble in RGB.
You have plate solved your original image, so you can remove stars (starnett, starXterminator) you can blend your synthetic chart on it.
But... you can do a lot of things with PI, some, like this, are subject to discussion.
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