or even him getting disbarred.

We already know Jimmy doesn't get convicted or disbarred. But anyway, no charges would be filed if for no other reason than it's "contrapment" (c) Bodie. Second, all Jimmy would have to say is, "My brother has serious mental issues. I had become his temporary emergency guardian shortly before this recording was made. I was worried about his safety and made up that story for his own mental health. Yes, even the part about 'Your word against mine'."

It would (and likely will) lead to embarrassment for Jimmy (and is almost certainly going to turn him into Saul), but it wouldn't be threat to Jimmy's freedom or even his livelihood.