I suggest housing your crickets with the MRP as a food source and dusting the crickets with the MRP before feeding.

They should attack the crickets because of the movement, and the MRP fed and dusted cricket should associate the scent and taste of the MRP as a food source. After a week or two of this your gecko should begin taking the MRP.
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"The band is just fantastic, that is really what I think. Oh by the way, which ones pink?"