I ended up using this. It gets the job done and the latter half of 2nd hotbar [food, alchemist button, blist button etc] could definitely be replaced by whatever. I found it pretty easy to access the first half of my 2nd hotbar using Ctrl+# of whatever I wanted to cast, so I put the not-too common skills there that weren't uncommon enough to put in the later half of the hotbars.
But if I had to give another SMN some advice I'd definitely tell you to make a form of those hotbars I have on the left. They're easy to click when I need to swiftcast raise/summon and it gives me a nice spot to put unique skills like Virus/Eye for an Eye/etc.

Honestly the most important thing in making a good hotbar for a SMN is making sure your DoT spells are in a comfortable and memorable position for you [not necessarily next to each other, whatever floats your boat]. Just mess around with the HUD and remember you can press Ctrl+Home to resize your selected hotbar.