I tried using all these 3 templates at once but they don't seem to work together. I can't use the Spectator mode while the "respawn position menu" is displayed.
Maybe add a Spectator button on the "respawn position menu".
Haven't tested the wave respawn template enough but it should work with the other 2 templates.
So while you are dead, you can spectate players from your group (only) and when all are dead you can start together as a team, could be a nice feature.