Unless you widen the journals or do a very significant undercut, the existing radius is what you’ll have to live with.  Building the journals back up in this area and then remachining for a larger radius is typically not recommended as this leaves a stress riser in the radius area and potentially makes the crankshaft weaker than what you started with.  Turning the crankshaft 0.010” undersize will not be enough of an undercut to allow any significant increase in journal radius but with due diligence, the existing radius can be maintained.  The other consideration when making a significant increase in journal radius is the clearance to the bearing and possibly the need to narrow the bearing itself so the bearing is not riding against the edge of the radius.

A good balance job will overcome some of the crankshaft shortcomings in relieving certain stresses imposed on the crankshaft.

Absolutely nothing wrong with using 0.001” oversize bearings if you can maintain your desired bearing clearances.