I say stay with chinning. It's really AFK and saves a ton of time/clicking. I'd rather pay the little extra to save time and effort on my part.
keep on chinning bro
Full Void, Fury, Ava's and yes range pots if possible. Essentially what you're trying to do is maximise prayer + range attack bonus, no need to worry about defence or anything else really as you'll be praying.
IIRC it might be worth taking a super anti poison or two, as the poison damage from the little spiders adds up over time.
It's hard to suggest an exact inventory without testing, you'd be better off with some trial and error and tweak to your needs.
You could chin but if it's too expensive, you could try alternatives like doing range nmz, tzhaar caves.

