As far as I know, the answer is no. If anyone else knows differently please share. One thought, however, is to create a discount code in the amount. Downside is that customer would need to apply the whole thing to the next purchase. If not, I guess you'd need to create a new code for the balance. Codes would be one-time use. You could create a tag just for that customer and make the codes apply just to customers with that tag.
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