in your position, SQ, I might look into some small plain coloured tags to indicate year on the keepers, and give all the females the next EID pair, just all the same colour from year to year. Would work out a lot cheaper, I think, than throwing away SET pairs each year.
When I first went to the moorland farm, one of the BFL tups had a small metal blue tag in his ear, along with his pedigree and flock tags. Ketchum do these tags, as turkey wing tags.