If I was doing it, I'd do something like put a layer of greaseproof paper or cling film (whatever hot glue doesn't stick to that well!) over the top of a metal / magnetic sheet. Put the basing magnets on top of that, then a blob of hot glue on top of the magnet followed by the mini. Hopefully minimal mess, minimal fuss, a good contact with the magnet and fingers crossed a good bond with the base...
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