Yeah, the escape potion is another good example of why I think it is possible. Although the mechanics given for that potion are incredibly vague, which has its pros and cons. Makes sense an enchanted item could do this as well as a potion could, just keep taking mental stress hits to make it work. It should be noted I'm not shooting for nonstop teleporting action all the time everywhere, just a solution to make it reasonably possible to do at all.
To be a pain I'll argue semantics, being in a zone is an action if you consider simply acting out a verb (being) as an action, if you can only block actions just block the verb as well as the prepositional phrase.
Also, ritual and thaumaturgy allow you to accomplish an impossible task. I don't think this always has to be modeled on the skill system. Otherwise yeah I can totally see your point about the cost/benefit analysis of teleporting Tedronai.
Orladdin, you can do self-sponsored magic? How does debt work then? It's a cool idea, I'm just a little fuzzy on how that works. Also the enchanted item you mention with reactive blocking works real well with the right flavoring, but what if you wish to move a certain number of zones in order to strategically place yourself?
Also, I'm still curious about what the consensus is on summoning objects that are native to the mortal realm. In the books, Bob mentions that it'd be really difficult, but not impossible. So how would you do it?
Another thought I had, would teleporting work best as a custom power? I almost think you could do it with RAW if you didn't mind sinking a lot of Refresh into it, Mythic Speed (Probably coupled with a Limitation for a bit of a rebate) that's active only in the Nevernever and Swift Transition and/or Worldwalker give me an image of a Nightcrawler like character. Yeah, not really teleportation some might say, but I consider teleportation to mostly be the ability to transcend all barriers at speed preferably as close to instantaneous as possible, but sometimes you can't avoid spending time and I can be cool with that.