I can't remember setting up an un-anodized rim tubeless until setting up road tubeless.
Perhaps that is the problem? Un-anodized aluminum reacting with the Stans.
(I have never seen caffe latex corrode a rim like that, even on a road tubeless setup)

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Those rims are likely aluminum-scandium alloy.

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Here's my data points:

WH-7900 TLs = corrosion. Silver, un-anodized rim

WH-7850SL/WH-6700 = no corrosion. Same tires, same quart of stans, same mounting procedure. Both the 7850 SL and 6700 have a black anodized finish on the rim bed, and show no corrosion.

I have these as well, also used Stan's 1-2 oz. My experience is some discoloration but no real loss of metal. Changing out the Stan's and cleaning the rim occasionally can't hurt.

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The trouble I run into is: what's a suitable alternative?

I've had very poor luck with cafelatex doing an effective job @ sealing. I'm also a skeptic of orange seal when it comes to high pressure: when I ran it in a MTB tire, it didn't seal holes that stan's would no problem.

Those on road tubeless: what sealant would you recommend?

Dura Ace + Stan's = bad idea, stans ate my rims
Dura Ace + Hutch Fast'air = read somewhere that this is the only sealant Shimano recommends, cant find the reference now. doesnt work as good as stans though
Dura Ace + Cafe Latex = better, although i read that some people still had pitting. unsure if this was caused by Stan's before the users switched.
Fulcrum 1 + Stan's = no issues experienced personally

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*duplicate post*

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Has anyone else noticed that Stan's NOTUBES is located in thw town of Big Flats (New York)?

http://www.notubes.com/ContactUs.aspx

Years ago ironically my car completely shut down on the highway passing by Big Flats. One moment I'm doing 60 mph the next I'm coasting into the side of the road.

_________________
I never took drugs to improve my performance at any time. I will be willing to stick my finger into a polygraph test if anyone with big media pull wants to take issue. If you buy a signed poster now it will not be tarnished later. --Graeme Obree

Fwiw running 2 sets of zonda's tubeless for 2 year w a bit of stan's, not enough to plug a hole but just enough to get a good seal. My zondas have the black ano inside. So far so good, but I'll prob check more regularly after seeing this. Also running fusion 3's.

Leonard Zinn wrote about this issue a couple of years ago at VeloNews- I don't have the link handy, but if you search the site, you'll find the article. As I recall, although he didn't say so in so many words, the only sealant that he recommended is CaffeeLatex.
My personal experience- I bought a pair of DA 7850 c24's on the auction site oh, maybe 18 months ago. They came mounted with Tubeless Fusions and the Stan's sealant conversion kit (the wheels were the CL's- so 3 layers of Stan's tape and Stan's sealant installed). It was not one of the best purchases that I've ever made on the 'Bay- one of the tires started leaking sealant as soon as I pumped it up, so I decided to unmount the tires and install regular clinchers and tubes; I was quite dismayed at the amount of corrosion on the rim bed, and even the spoke nipples had a little ball of corrosion on top of each nipple. Not quite as bad as CerveloMikey's photo, but real close. I cleaned up the rims with a green scotch pad and some alcohol, and inspected the clincher bead closely, and decided that they were safe, and rode them for several months, but I was never quite comfortable on them- they're sitting in my garage now.