a subtle difference "Just a kind reminder" infers that the reminder itself is a kind one. Kind being an adjective describing reminder. "Just a kindly reminder" infers that a reminder is being given kindly.
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Goodmanjust a Kindly Reminder- is not an adjective and there is no verb to follow to allow it to function as an adverd, therefore it's misuesed.Actually, kindly is also an adjective, and it's listed first as an adjective in this dictionary entry: