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IMO there isn't going to be any way to seal it without somehow getting another sutd in there. I was in somewhat the same situation as you. I broke the stud closest to the firewall when I was tightening the nut. I was not about to pull my whole turbo setup and maybe even the head to extract it. I had a 3 layer metal gasket from the 01 sentra 2.0L.
Just a couple weeks ago I started some maintainance on my car and pulled a lot of stuff off including the turbo. Turns out the heat from the exhaust actually weakened the gasket and broke it and definately was leaking. RTV may help but I think there will be some sort of leak still.
During my maintenance I pulled the head and used a left hand drill bit and punch in extractor. It worked beautifully. The most important thing is to use a good penetrating oil and use a hammer to knock loose the stress that is keeping it from breaking loose.
Just curious, is this a sr or ka you are working on?
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