His poison is horrible, so I would suggest taking your whm with you and just be on poisona and stona duty. I have seen a nin/dnc solo it, so it is possible, you just have to pay extra close attn and turn during the petra move. If you go dnc/nin, you can keep shadows up to avoid the poison. You could always amber farm KI, but no matter how many times we did this with our friends Twash, we always ended up with the same KI over and over again and still had to kill some NMs. We decided to go straight NM KI farming when we worked on mine.
I highly suggest having some form of TH when you get to the actual Glavoid kills. I was able to get all 50 of my shells in 26 Glavoids, which saved a lot of time.