I've made the switch to immersion waxing + eventual drip this past Summer. I use the Silca system, after learning about the Wippermann wax line.

There's (hopefully) no going back. Much cleaner and strong indication that the drivetrain's expected life is quadrupled.

Now, waxing is perhaps more suited to commuting (high mileage, easy access to waxing paraphernalia) than touring. My plan for next trip is to carry a second chain (expected to last 800kms between immersion baths) and to apply drip wax (200-300kms per application). Nightmare scenario is consecutive days of heavy rain, but it never really happened to me before, so perhaps not a deal breaker.

If anyone has experience with this setup, I'll read with interest.