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Just saw this, sorry! If I understand your question, Pace McCulloch I've done a couple things like this before. I would create a new field for the form so it doesn't update the field you're trying to append to.
Afterward, use a smart campaign to add the new details to the original field. Just make sure when updating the field, to put in the token of the old field, then add then the new information with the new token.
I'm sure that was very confusing over text...