Facet like coord_trans_xy

[willgearty]

coord_trans_xy() is pretty nifty, even if it's not that useful outside of making plots like this:

However, one of the limitations of coord_trans_xy is that it can only modify the appearance of geoms within individual panels. We really would like to see something like this, but much prettier:

Or something like this:

I think something like this would be possible with a custom facet, since we get to design the entire panel arrangement and how the strips are plotted.