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Chances are the frame is already cut for a .45 feedramp. Your smith will have to mill the frame for a ramped barrel if you go with anything but .45.
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The frame ramp is pretty the the same with both calibers (9mm and 45 ACP) the difference is in the barrel ramp (height and width, etc)...I have
done plenty of standard .45 ACP to 9mm NATO conversions with no Issues using original .45 ACP Colt/Springfield 70 series frames...They all
have functioned perfect and they tend to be easier to time as well for some reason for me...(maybe because I have no so many).
The 9mm round in a full size 1911 pistol is so easy shooting and a real pleasure for many people due to the lower felt recoil vs. the standard .45
ACP round and it is cheaper to shoot as well, etc.
Good luck.