This worked like a charm...
Keeping all these point in mind, I greyed down adjacent areas first. In this case the adjacent colors are a value1-2 (Munsell) really dark fuchsia/red. Then I added for punch pure high chroma paint "Cad Red "(sorry Marvin
). After that I let the area dry completely and did a wash of the base color over it. This was done to make sure the area harmonizes with the rest and to keep it within a proximate value. If you squint, the punched up area should dissapear more or less into the adjacent areas. It does it nicely on the painting. No white was used and the result is a nice glow.
This glow effect only works well if used very sparingly in very selected areas and I would recommend being very, very selective about where do add this type of punch.