Teleporter IPC integration?
if you're experimenting with IPCs why not incorporate Teleporter and have a TP action button that you can configure based on available destinations.
I like this idea, will look into it Later™. I would need to figure out what icons to use for teleport actions (are generic icons good?) and how to communicate to the user in-UI that they need the Teleporter IPC installed.
For anyone here in the meantime though, you can work around this by using the Command action and using /tp <My Destination>.
here's a Dropbox link with the Icon Exports i mentioned on Dsicord:
also, i was mostly just thinking the generic Teleport action icon or the Aetheryte icon, at least that's what i'm using on my command action buttons.

I suppose, if you wanted to be fancy, you could use the city state icon that matches the region like they have in the in-game TP menu, but i'm not sure how difficult that would be to implement.
Slating this for a 0.3 release, but probably with limited/no icon support as the game just doesn't have the assets I want to do this effectively. Oh well.
So, good news and bad news.
Good news, it works:

Bad news: I am really unhappy with how this turned out. I know I'm being a perfectionist, but the lack of icons and the fact that regions don't group properly (e.g. you have Hingashi and Kugane in the dropdown) make me a bit hesitant to ship this.
All the code is up in the features/teleport branch, and it's pretty usable, but I'm not going to be shipping this with 0.3.0.
I'll keep investigating a way to make this work the way I want and hopefully this'll land in a 0.3.x release.