No, but is your problem getting the initial link to the video wall, or getting a timestamped link to the video wall?
Depending on how many video walls you have....the video wall links take the same "timestamp" parameter as an individual camera, so you could manually create your own list of links to your video walls and then generate timestamped links programmatically by just adding the timestamps as follows
The API gives an example of linking to a camera as such
https://nxx.meraki.com/office-cameras/n/bs0a1k/manage/nodes/new_list/29048243992402?timestamp=153573...
which is basically the URL of the camera + "?timestamp=<time>"
Video walls use the same format...so if this is your video wall
https://nxx.meraki.com/office-cameras/n/bs0a1k/manage/video/video_wall/69048243912443
just adding "?timestamp=1535732570077" to the end of the link has a similar effect