That's a mighty impressive list already, Geoff. Nothing essential is really missing, so you're really just thinking about stepping up to the next level of quality, no?
If you're thinking about Royers, and you're concerned that your current ribbon is too delicate for transport, then you might want to take a look at Shure's ribbon mics. I haven't ever heard one, though. They're priced comparably to Royers but I gotta imagine that Shure would not make an overly-fragile microphone of any type.
If you're looking specifically for a ribbon for vocals, I'm a big fan of AEA. They're also pricey, but different from your average ribbon mic. For one thing, they make a stereo microphone, the only stereo ribbon I'm aware of. They have some very nice mics that are more affordable than the Royers or Shures, used mostly for miking guitar cabinets but a friend reports than an R92 works great for vocals.
But it's AEA's flagship product that's far and away my favorite microphone of all time, and would be at the very top of my shopping list if I won the lottery.
That's a reproduction of the classic RCA model 44. Real vintage 44s are almost impossible to get and cost as much as a Lexus. Heavyweights such as Barbara Streisand have their own that they take to the studios. Mortals can get AEA's reproductions. Still pricey, though: $2500 for the exact replica, or $5000 for the active version. The active version has a built-in preamp so you can plug it into any old interface/preamp and won't need a special amplifier. The passive version is half the price but requires an expensive (~$1500) preamp.
For stage use, Neumann does make a handheld condenser that's quite nice but prone to sibilance due to its extended highs. I see them being used a lot on live television, e.g. American Idol and the CMAs. Those go for about $700. I wouldn't buy one for my own voice, which benefits from the frequency response of ribbons and dynamics over condensers. But I'll bet they'd be great for things like acoustic guitar or drum overheads and female vocals.
One thing that's not on your list is a high-end large-diaphragm condenser. For that category, the Shure KSM-44 is a great value. Rugged, crystal-clear, extremely low noise and around $1000. Same price as the superb Mojave Audio (David Royer's other company) MA-200, but far more flexible. For a less-expensive vocal condenser, Mojave Audio's MA-201FET is really good and goes for around $600, but like the MA-200 it's cardiod-only.
For maximum flexibility, for a microphone that can take on literally any job, I don't think anything beats the old standby AKG C414. It's a LDC but smaller than most so it fits into tighter spaces. IIRC it has 5 polar patterns. A great mic that was going for $1200 last time I checked. You can literally use it for anything.