Performing your Constitutional duty as a Member of Congress to certify the results of the electoral college cannot be an act of insurrection. If a Democratic Congress passes something this egregious (which they won't), there's no way SCOTUS allows it.
I'll grant that Congress is unlikely to expel anyone for simply being an idiot, and even less likely to invoke Article XIV Section 3 while doing it.
That said, if anyone went beyond simple idiocy to call for other idiots to storm Congress, I can see it happening.