The following article includes details on how to use a Hyperlink Tile to open an app. The article has some links showing how you can use Fully Kiosk Browser to find the intent for any app.
You could use it with a Hyperlink compatible tile (Hyperlink Tile, Media Tile, Variable Tile). You could either open it in a new/same window or if you host the Room Web Controller with an SSL certificate, you could use the Open in Modal option for hyperlinks.