Call the repairman to verify what type glue he used if you're on speaking terms. 'cause if it's water based, acetone should not be used IMO.g'luck If he was authorized it should be HHG which may need heat to soften and clean.
Acetone will dissolve the finish more likely than not so limiting it's action to only the crack would be dificult. The wood will wick it. Have you tried a "four handed" approach with someone mildly heating the crack while you gently pull on it? This way you might be able to get the adhesive to relax enough to reopen it and then hand scrape the ends.
If you're sure that it's CA I guess you could try applying CA remover applied to the crack with a pipette. I've never tried using it to re- open CA glued cracks, I only have it on standby in my 'shop in case I stick my fingers together (or worse). It works well for stuck-together fingers though, don't ask me how I know that :-)
Heat and water loosen hide glue (maybe a tad a acetic acid, vinegar) - acetone will eat most everything else (including your safety glasses lens if you splash it high enough, or your eye glasses or plastic contacts if you're not wearing safety glasses, or your eyes, etc., etc.,).. Nasty stuff but sometimes it's all that works.