A hotfix has reduced the Epic gear to 20 Twilight's Blade Insignia (was 40)
Interestingly, the items do have different ids, though their appearances are exactly the same.
So, if you're only interested in collecting the appearance for transmog, rather than the actual catch-up gear itself, visit Armorer Kalinovan on any non-max level alt for only 0 Twilight's Blade Insignia instead! Keep in mind that these appearances can also be acquired as Warbound gear randomly dropped from rares in the area, so consider waiting to purchase transmog until after completing Two Minutes to Midnight and collecting everything else the event has to offer.
Twilight Ascension - Midnight Pre-Patch Overview
Starting the Midnight pre-patch event is quite easy, with a simple lead-in quest from Stormwind or Orgrimmar teleporting you to the Twilight Highlands. Upon completing Cult It Out, yiou'll be able to farm Twilight's Blade Insignia from weekly quests, world quests, and rare mobs.
Disrupt the Call weekly awards 0 Twilight's Blade Insignia
Twilight's Dawn weekly awards 0 Twilight's Blade Insignia
World quests award 0 Twilight's Blade Insignia
Rares were recently hotfixed to award 2-3 Twilight's Blade Insignia each
Within the small allied encampment, Armorer Kalinovan sells all of the gear, while Materialist Ophinell sells cosmetic rewards. Other rewards include the Twilight's Blade Tabard and title.
