You could perhaps print the area of concern a stop or two darker than the rest (with standard dodge and burn techniques) and then bleach that area selectively. Selective bleaching can really boost contrast a lot. Depending on your bleach, you can reduce proportionally or attack highlights and lend 'brilliance' to them.

Nutty though it may sound if you haven't tried, you can also print small parts of a print at a different grade than the rest, I have played with this and all you do is use multigrade paper and filters and experiment. Under the enlarger, you can lay the filter directly on the print until you figure out which filter and exposure ratio to use, and go from there.