Trying to keep up with IPM methods for varroa: rather than freeze drone brood, which requires additonal frames to swap out each time you visit the freezer- can't you just use an uncapping scratcher on site to kill the drone brood and lower varroa counts?

would the varroa be mature enough to hop off the drone pupae, at capped brood stage, onto the workers? (if so its back to the freezer)