I'm familiar with Chris Ross and will wait for his advice, especially if the alternative is over $500 and over a month's wait.
If I had a good deep place to dive, stuffing it full of toilet paper and going to 60+ feet would probably work. In Ohio, quarry diving is miserable until April and they probably aren't deep enough anyway. I planned to try this summer but never got the chance.
I completely fail to understand the physics here. If it leaks immediately at 60 feet with very little vacuum, and that a pressure difference of 30psi, then it should leak immediately with 30psi of vacuum on the surface, right? Maybe the Nauticam pump isn't strong enough to pull 30psi, but their are no leaks with the strongest vacuum I can get for 48 hours but it leaks in 5 minutes every time 60 feet down with normal use.