Add a tempo mark, don't display the reference note and in the caption field, use a special text sequence like $(S1 5) = $(S1 5). You can change the "S1" into "S2" or "S3" to change the size of the notes. There is more information in the manual Notation>Text commands (Text advanced display). You could also add a text object to the staff, and mix characters from the SToccata font ("e" will output a quaver) and a regular font for the "=".
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Harmony Assistant - Ubuntu + Wine et Windows XP sur machine virtuelle. VS, OMeR, PDF2M