Dennis, almost all luthiers will install a pickup if you request it. I have a MMD with an internal pickup and will probably have my Blue Lion retrofitted with one as well.
I don't think you should buy a dulcimer simply for the pickup. Find the dulcimer that most meats your needs or whose sound you prefer and have a pickup installed in it.
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Dusty T., Northern California
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As a musician, you have to keep one foot back in the past and one foot forward into the future.
-- Dizzy Gillespie