It’s relatively easy to adapt a standard brood frame to accept grafts or Jenter cups.
If you are grafting into CupKit or Nicot cups it’s just a case of equipping a standard frame with one or two rails wooden rails and attaching the plastic cell bar blocks and caps. You can get these and the cups from Thornes. Here: https://www.thorne.co.uk/queen/queen-rearing?product_id=6776 and here: https://www.thorne.co.uk/queen/queen-rearing?product_id=4442
Or if you are using a Jenter kit you can get these metal bars from Thornes here: https://www.thorne.co.uk/queen/queen-rearing?product_id=4458 then it’s just a case of cutting a couple of slots in a standard brood frame.
Hope this helps.