Do you think the danger now is the GOP will maneuver Trump to resign so that Pence is made president before November elections?

And then try to pull a Nixon/Ford style pardon?

I certainly hope not. A fundie in the Oval Office would be 10x worse than Trump.

No

It's their only real choice

Hard to say, certainly Pence would be expected to pardon Trump if Trump steps down before formal impeachment is handed down. However there's no guarantee that Pence will come out of this intact either.