Scratching my head, it sounds pretty simple though. A DECIMAL type is probably implemented (for you) as a BigDecimal.
You can toString() that type. Once you've got a string, you're most of the way to BCD. Take each character, subtract "0" and stuff the result in a byte of a byte array. For signed numbers, that's a trickier proposition and depends on the packed format; I don't recall any signed BCD formats offhand.
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