A couple of suggestions...
I’m far from an experienced builder but a couple of things you could try are:
Use high opacity wood touch paints and feather in the edges around the spots. You may even be able to simulate the wenge grain using different shades and a very fine brush. These paints stick to pretty much anything and the solvent is a cellulose thinner type.
The other alternative I can think of would be earth pigment suspended in shellac. One of my tutors uses this for a variety of fine touch up work.
Both of these suggestions are going to take a lot of time and will need to be applied after sanding but before the final finish.
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