Since you said that these snap have to be classic snaps, I see no technical limitation.
The process for handling installer snaps is still TBD though. From https://forum.snapcraft.io/t/classic-confinement-for-yarn/2686/4:
“Regardless of the answer to that, I’d like to get a definitive answer on this sort of snap. @niemeyer - can you comment? If we want to accept these sort of snaps, are there guidelines we can follow to help protect users and the store’s reputation?”