I would avoid it. I was in a similar situation years ago where a hole was cut for an intercooler and an RWC could not be obtained until it passed engineers. This is in Vic, so not sure about the laws in your state.
You could be dodgy and try to cover the hole up, prime paint and seal and hope the mechanic doing the rwc doesn't pick it up, but I wouldn't want a car that's structurally compromised personally.
Keep looking mate, the right one will pop up it just takes time and persistence.