One USB-C hub that might work (there are not many with a USB-C with DisplayPort alt mode output) is the HP Thunderbolt Dock G2 (it supports USB-C or Thunderbolt input). Maybe any USB-C hub with DisplayPort output can work. LG (32SQ780S) - 32-Inch 4K UHD(3840x2160) Display, Ergo Stand, webOS Smart Monitor, ThinQ Home, Magic Remote, USB Type-C™, 2x5W Stereo Speakers, AirPlay 2, Screen Share, Bluetooth,White LG UltraFine 31.5-Inch Computer Monitor 32UP83A-W, IPS with HDR 10 Compatibility and AMD FreeSync, White LTO2SNY.

lg monitor usb c not working