Meetup2 connected to LG Touch USB Hub

In our standard BYOD config is Rally Bar/ Mini connected via USBC -> USBA and HDMI -> HDMI 1 of a LG Touch screens USB Hub. We see a Wallpaper and and if a Laptop connects the Share goes directly to the Screen and use Audio/Cam from the bar + we get charging from the LG.

However this is not possible on a Meetup2. Just connect USBC -> USBA is OK but if I connect HDMI the Wallpaper will be triggered away by "connect HDMI" screen.