We were just waiting fro the problems to happen as we have seen this at least 10 times in the past few months.
Took 2 days for the creaks to kick in.
As its for the slam he isnt allowed to modify it so its the same as the others that will be used.
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No problem, its all theoretical at the moment as he hasnt changed anything yet but i think i read enough about it.
Let us know how you get on if you do go ahead.
If you dont have the proper tools, you can carefully remove/install bb30 bearings with headset tools (we use the park ones, not sure how well others would work).
I've got a Problem Solvers BB30 adaptor in my Cannondale. Uses the existing BB30 bearings and some cups to fit 24mm spindle cranks. Seems a neat and well made solution.