It's a neat idea, But if you find yourself going to your guild related town often i'd just keep my HP set there. Between Outposts, Maw warps from Horst, 10 point warp scrolls via conquest points, you have a decent amount of options. Even more if you have a whm or blm sub job. (assuming you are crafting on a main character and not a mule)

An item like that would also steal the thunder away from "Ease of Exploration" when it is available from mog tablet collections. Making it no longer special.