That could happen anyway. Realistically, if someone makes up their mind to overspend in one way or another or to seek financing that they don't report, that presumably is something that could occur under the status quo, so I don't think you are necessarily going to get this automatic result.
In terms of a charter challenge on banning the ability to borrow money, I can't see how.... It doesn't have the effect of hurting secondary players or people who are outsiders or who have less access to resources or minorities in any particular way, because those who are already the most well heeled have the most plausible case that they'll be able to repay. They are precisely the ones who would be able to get financing anyway. So I can't see on what basis one would challenge its constitutionality.