Richard
Have you found what you are looking for? You mentioned "old master techniques"; may I ask which old masters you have in mind. Maybe I will have some suggestions for you, depending on the era of painting you're interested in emulating.
Frankly, I'm generally skeptical about "glazing over a monochrome underpainting" ever having been a widespread and effective method. Most of the paintings I have seen that I know were painted in this manner, look terrible today because much of the glazed colour has long since disappeared.
All best.
Juan
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