I don’t think there’s a ‘fast’ way to deal with this.
What I would do is hit matchframe on the last frame of the speed up clip and put a locater on the source clip position. Go back to first frame of speed up and hit matchframe again, this will put an in point on the first frame in your source. Then go to the locater you already added and put an out point there. Now insert this clip and delete the speed up. Not sure if it’s the fastest way…
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