Could any Life player outside of the Seer, Mage, and Heir class potentially make sometime similar to the dream bubbles (provided horrorterror assistance)?

In a way, you could make a case for almost every Life Player, if not all of them, but the main thing here is having someone actually able to commune with the Horrorterrors. Feferi was a Fuchsia Heiress to Alternia, with an Emissary of the Horrorterrors as her Lusus, provided by Doc Scratch, those circumstances are INCREDIBLY specific.