Fort Rox: Heart of the Meteor.
I don't know how much gold you have, but you might check the Marketplace. I'm guessing the price of the two pieces has come down since Ronza's visit and they weren't THAT expensive in the first place. Then you can hang onto the portal until the egg hunt. Make sure you have plenty of cheese ready to go.
By the way, this is a nice area for passive hunting, so if you need to go offline for a while, this is a good area to do so.
Frift: 1 more battery
The batteries are a nicety. I've caught 19 Ascended Elders with eight and nine batteries.
....and get the Mysteriously unYielding Null-Onyx Rampart of Cascading Amperes trap.
How's your catch rate in the BWRift? If it's good, you can skip this one and save yourself a lot of gold.
The last two areas, yeah, those will take a while. I say pick one and dedicate yourself to it. Neither area is particularly nice to passively play in. I mean you can count your hunts and make sure you time it correctly when you go offline to make sure you don't waste cheese, but even so, it doesn't always set up that nicely.
For the record, I think I'm the only NarniaWebber with the Temporal Turbine. I just got lucky with the drops. I'm nowhere near the Timesplit Dissonance trap though, and I'm taking a break to work on Chrome maps and then probably some Relic Hunter maps.
Watching Jacob's art FBF was interesting. He's tweaking the level shields and did Novice through Legendary today and plans to do more shields on the next FBF. It'll be interesting to see what they decide on for future levels.