This functionality is built into the new system. Make a separate set with helmet off, and Ignore on all other slots. You can then individually toggle off your helmet in every other outfit at zero cost other than the setup without access to a transmog vendor.
+1 to your suggestion. If there are concerns about hardware space or whatever, even just having locally saved Custom Sets beyond the 25 cap (like we do for macros) would be a tremendous help.
This functionality is built into the new system. You can disable situations entirely, manually swap outfits (even without a transmog vendor!), or temporarily lock situations out situations while swapping to a specific outfit. There is no cost to editing, disabling, or locking situations.
We only essentially have one outfit slot per spec on live, but without the multi weapon functionality. You can purchase nothing and use the system exactly how we do on live today, plus or minus gold cost based on how often you switch to brand new transmogs.
My worry with this is that other than a small few edge cases, the new system is drastically better than the old one. The old system, however, is slightly less complicated because it has significantly less power and flexibility. If you draw people into the old system, they will have to deal with the frustrations of the old system like paying money with every upgrade, and running into issues when respeccing.
It’s probably best that Blizzard focus on a solution that can help the edge cases rather than have both systems in side by side.
It’s not removed in any way, shape, or from with the exception of transmog by slot instead of by item. You can still use the 20 outfits you set up on live (they’re now called a custom sets), change them manually whenever you want by pressing two buttons, and not have any form of automation through situations. You can completely ignore the second free outfit slot, too.
I disagree. If you only use the first free slot, it works like it does on live minus slot based transmog. Slots 2-20 just add brand new functionality and the option to use situations. It is also extremely cheap for the first five slots (like 20 minutes worth of dailies and you have five account wide outfit slots), pretty cheap for the first 10 slots, still not too expensive for the first 15 slots. The last two slots alone are 25% of that entire 800k cost. Like warbound banks, there’s some huge gold sinks for whales but most people will be perfectly fine with the cheap stuff.