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IDK about that specific application, but an adaptor BB is a better bet than the inserts.
Just be warned that if you're running a Synapse or other C-dale, their BB30 BB is BB30*A* and is 5mm wider than a normal BB30. AMHIK I've found ONE company (Kogel, thru here. Thanks again guys!) that makes a BB30A to Shimano 24mm/GXP BB.
FAR fewer problems overall with the right stuff in there than sleeving something down
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