I do wonder how much of this is driven by loud minorities on both sides rather than by actual majorities anywhere.
I at least would happily vote for a mixed ticket that seemed to be committed to make bipartisanship work. I'm sick of our hate-fueled political system and am desperately hoping for a change.
However, having a mixed-party ticket like this doesn't need to worry about swaying the Trump voters; they're not going to change their vote for anyone. The appeal here is to get some of the minority of GOP voters, the "never-Trumpers" and others who really don't like Trump much, to switch their vote (or actually vote, if they're sitting it out in disgust).
I do think this idea would succeed in getting some of these peoples' votes. However, I have no idea if that would outweigh the number of votes they'd lose from people on the left.