Regarding the relic to zodiac part, you can buy the base relic from the Calamity Salvager for around.. 57k, if I recall, and use it as glamour. But if you want one of the relic styles with the glow, then you'd have to build it back up to that point..

Considering how the zodiac quest line will be nerfed some time in Heavensward so that people can make them for glamour, hopefully we'll get more options.