You probably have problems locating that comment because it is hidden as it came from a shadow-banned account.
As for the above post - I do not see why an "UV to counter DV" should be treated more favourably than a regular UV.
The technical part is interesting as my proposition also has to deal with DVs going past the zero threshold (it would be too easy to park $20 worth of your DV mana on a $0.01 post) AND allow these to still be upvoted back to positive numbers.