Both of those are serious enough to make me want to go back to looking at some DBD subclass with an overridden method instead of using the callback, but I'm not sure it will be worth the effort.
Using a different DBD is what I recommended, and I still do. You'll probably want it to act as a wrapper to an existing DBD.
If you absolutely refuse to change the DSN, you can make your Wrapper DBD transparent by using the callback mechanism. Just like the linked example switches Sybase for Gofer, your callback would switch the original handle for a wrapped handle.
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