Great, yes I was going to go down that route.
I will do some testing tomorrow. But from searching I think I could add do_action() to
comet-cache-pro\src\includes\traits\Plugin\WcpPostUtils.php line 29
autoClearPostCache($post_id, $force = false)
I know the original plugin devs have moved on, but if you know a better place I could add this please let me know.
I will let you know how I get on.