Feel free to propose a punishment that isn't disproportionate to somebody. I don't think such a punishment exists, aside from crazy edge cases like "do not enforce the law".

Go ahead. Try to make a suggestion that won't punish some people more than others.

In case it makes you feel any better about the system of fines, we can say that the disproportionate impact is itself a punishment for the lifestyle choices that lead to being poor. OK, that is awful, but it's some sort of justification.