Here's the video I recorded of soloing the belts as SV:
https://www.youtube.com/watch?v=uKpisCG1yUc
Massively inflated item level for the win eh? It's not exactly textbook but it was easier than I expected. Use serpent + glyph stampede, set up cooldowns and outgear the fight and you should be good to go.
As Rustyboy said, don't attempt this if you are progressing on Siegecrafter still. If you want to solo more than one belt outrange the heroism on the pull and use drums later. Hero for the first belt is unnecessary, trinkets alone should be enough for the first belt even if your gear isn't great.
I went with:
1.) Prepot + Trinks + Synapse
2.) RF + Stampede
3.) Drums + Synapse + late RF
4.) AoC + Potion