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I suspect if you try to expand your corners with wedges you'll risk causing problems with the frame I presume it's in? Not usually a lot of gap once a canvas has been framed. What do you do if you expand your corners and it won't go back in the frame?
Restretching doesn't have to be as daunting as you fear, although as Karin has experienced, don't remove the canvas completely! Try restretching one side at a time. Gently! Remove all tacks/staples on oposing sides and gently stretch as you re-tack. Then do the other two sides. Providing the sag isn't enormous to begin with, this should work.
Is the client prepared to relocate the painting for a period to see if it self-tightens? They may then consider another wall?
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