I think the advice is to hang onto them.
If you don't need to feed in June (and it is possible that it might be a very thin time this dry year), then you could give them to the bees when you remove the honey crop (or rather after any after-crop treatment). Then, putting them in a 'nadir' shallow box under the brood box would be one way the bees might empty them. That way, they could have all winter to try and deal with the stuff! Another possibility might be to offer them as per 'wet supers' for robbing above an open crown board (which ought to be called a clearer board without an escape fitted, but hey ...) Offering them above the crownboard would make it easier for you to occasionally mist them with water, to ease the use/reuse after it has set solid. My suspicion is that, if going that route, it would be best to only offer them one frame at a time, so that they could concentrate their efforts, and you avoided being left with more than one half-emptied frame ... to try and store for another year!
But for now, likely just keep them safe until they are needed.