If you have chickens, or a friend who does, just give the foundationless drone frames to them to clean out.
But also remember (in addition to getting them out on time), that when the greatest need for mite suppression occurs (after mid-summer) the bees are getting more reluctant to draw out and fill drone cells, so they stop being as useful.
They may be most useful for a round, or two, in late spring and early summer as a means of moving the starting point backwards on the mite numbers at the outset of the season, but then switching to another harm-reduction strategy as time goes by. Good, season-long mite monitoring will give you the guidance you need.
Nancy