I bought the Codex, and since then I've accumulated 500 sprockets so I've been able to buy another cog. I now have 2 AAs and 10 cogs.
AND a Timesplit Rune, from my second AA!
I'll aim for 150 Ancient Rift cheese during my third run, and use more than half of it for Runic. If possible, I'll do all the mini-games - you get the advantages of them whether you get the curses or not, and so far I haven't found the curses too hard to reset or avoid. That's with only 2 runs, though.
There's a risk that I might be playing less active over the next month - I have a RL project that may take some time, and it may be easier just to park myself somewhere and catch whatever comes. I have made a good amount of Jungle of Dread cheeses, and may aim for silvering some of the mice there - with enough cheese, it's a good place for passive hunting.
When I'm active, I'll go for more AAs or for more treasure maps (I use a lot of Ancient charms, and I enjoy doing maps).