I don't have a weak aura for that but I just updated my addon 'Troll The Bones' for patch 7.2.5.
So if you don't mind downloading an addon this might be something for you:
https://mods.curse.com/addons/wow/troll-the-bones
Watch for version 1.3.2, it's still under review, should be up in some minutes. Older versions don#t work anymore.
You could configure it to do nothing than playing a sound file when you've rolled all five buffs, but it can do a bit more (like graphically showing the active RTB buffs). You can also replace the sound file in the addon's folder, they need to be in .ogg format.