Adjust In-point of Replaced Footage (Without Touching Edit)

I have a project file where all the edits to an old piece of footage have already been completed. The original raw footage was replaced, with just a clip of the required footage (to save disk space).

Pointing Premiere to the clip and replacing the footage is easy enough, but the entire timeline/edit is off now (because the clip is shorter and no longer the full file).

I need an easy way to tell Premiere where the new in-point of the video is of the clip, so it will shift everything back into sync, and the cuts all line up again. This should be doable, I have a screenshot of what the first frame was (and can match it by eye to the cut myself).

I just need it to do it from a sync/in-point process (as I can't touch the timeline itself). Had the original raw file been dropped into a separate comp first, this wouldn't have been a problem (but too late for that unfortunately).