Assuming you don't have a deer bone to hand, try this: stick a good bit of normal black wax polish on the caps (normally not necessary for cordovan). Put some trees in - whatever you have that reaches deepest into the toe. Rub the caps in a circular motion, quite firmly, with the back of a stainless steel spoon - a good stiff one. Then brush off the polish and buff as usual.
As long as the actual toe box isn't damaged underneath, it should help smooth it out a little. You might want to do this more than once for an incremental effect.
Let me know how it goes. If it does something bad, blame yourself for believing the internet. If it works well, you may thank me personally. OK?