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Looks like Samuel Lai is already selling corner core kits for the YJ mini 4x4. This is his personal cube where he added repelling magnets to the hidden edges, but it does a good job of showing his core magnetization mechanism. Seems a lot like the Cuber's Home kits. He doesn't seem to have a storefront to buy these from, but if you message him on Instagram I think you can get your core magnetized mini 4x4 to be a reality. He also goes by Lai S Cuber on YouTube and has a few interesting videos on modifications of puzzles.
Not exactly a new puzzle, I know, but relevant to recent discussion in this thread.