I'm keeping track of 62+ set codes on MTGA (cause you don’t make it easy). And until recently, "cube-52.60" was working as a poorly named but findable grouping of cards that are not otherwise grouped together in any other way.

Why not make a singular list of Powered Cube Cards. These cards could be co-listed with two set codes. That they are a part of Powered Cube Collection (PCC) and whatever set a given set that was used for a specific card

And please work with sites like Scryfall to make sure their databases are EASILY maintained. (Third party sites should go through some vetting, sign an NDA and then get prerelease datadump, say 7 to 14 days before it is supposed to go live. Card text in english, full format availability, and even images. Since you seem to have the sets finalised at least 12 months before set release date, making this data availably is just best practices. WotC employees should be surveyed if they use Scryfall or the Gatherer as their go to search)