Lots of options. Here's 4:
Simplest, Don't do anything. Apart from red crosses on your video cues everything else will work as normal
Audition Window, but only if you are only using 1 audio interface and no lighting
If all your video cues are all in timeline groups, save a new version of your workspace e.g myWorkspaceJUL4.qlab4, select all cues. select only video cues using pop up menu on basics tab of inspector, delete all video cues, save.
If you have a video license, save a new version of your workspace as above, edit your video surface, delete display, add a syphon surface.
Mic