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Hope Funko Mystery Minis Series 2 has some fusions.
Smoky Quartz
Stevonnie
Sugilite
Opal
Sardonyx
Alexandrite
Rainbow Quartz
Malachite
Round it off with Ruby, Sapphire, Jasper, Sadie and a new Peridot that looks happy. Real easy for repaint variants on Ruby too because of the five homeworld Rubies.
Of course a new Steven, Amethyst, Pearl and Garnet would likely be necessary since they're the bread and butter of the show, so doubtful we could get all of those new characters.