Well, I would prepare 3 envelopes..... No, seriously, some projects like this are lost causes. The company wants to just get maximal return on minimal effort.

Well, I would prepare 3 envelopes..... No, seriously, some projects like this are lost causes. The company wants to just get maximal return on minimal effort. A rewrite is going to be a sunk cost with no return. Basically, your job is to limp it along if you can't prove that a rewrite will make them more money. If you don't like that answer, you might as well look elsewhere.