[ianhowson]

It won't work with the LG Ultrafine 5k, which requires a Thunderbolt connection to run at full resolution, and behind-the-scenes is a tiled pair of DP1.2 displays.

It ought to work with a DisplayPort 1.4 5k, though there aren't many of those.

[anyfoo]

Thanks. So as far as I can tell, that ridiculously expensive switch is still the only option (if even, I wasn't able to fully confirm), and nowhere near worth the cost vs. just physically swapping the cable between computers.