Can you teleport outside? Sure.
Is it safe? So long as there's no rain to smudge your diagram it's basically as safe as doing it indoors. And in Lucien's defense there wasn't any rain at all, right up until the last sylabble of the incantation.
"Assuming our composers and writers and such match dead artists in yours, we could have them make new media that they never got to in our world? Alternatively we can pay in resurrections if there are people demons want resurrected."
"Oh, you can totally sell it, it just - requires selling, instead of being something that every demon will already have on the tip of their tongue as soon as they notice they've been allowed to talk on summons. - people in my world get an afterlife, I don't know how that would interact."
"My world has an afterlife too - it nabs people out of it and puts them in mortal bodies and I'd expect it to do the same for yours?"
"Eternal dreaming type thing? Not everyone goes there. I think it's unpleasant if you had a traumatic life and not great even if you had a nice one but people aren't actually aware enough for it to be too horrible."
"Huh, ours is different. Some of us become demons, for one thing, so that's pretty sweet, please don't resurrect me."
"It's a bummer. I mean, being a demon is great, but I couldn't get in touch with my parents till after they died."
"- yes, that would be amazing, Limbo is pretty impoverished and the team that loads up the train to send them whenever we have a concordance between the planes could make it just about as nice as the daeva worlds!"
"Sending a single digit number of demons across once would do ninety percent of the work, we can make a shitton of stuff really fast."
"Hm, assuming people also go to limbo when they die sometimes, would resurrecting a limboite to milliways work for this? With you letting demons in through the door and them letting the demons back out into limbo."
"...maybe. I don't want to do either of my parents, though, they both got unusually good Limbo results - uh, dying to Limbo gets you one indestructible thing, like your favorite dog or a tree or a musical instrument or something, and she's got a camper van and he's got his entire house, and if this plan fails at some stage I don't want to have messed that up for them... My mom fostered some kids in Limbo, I can dig up what I know about those and see if any of them are good candidates. Pity we can't actually ask anyone..."
"I can try to wrangle teleportation to limbo? I'd expect it to be possible in theory. Targeting can be finnicky though - I didn't end up here on purpose."
"And I cannot replace you if you should go astray never to return, now, can I. - actually, can you teach your resurrection thing or do you need to be inherently magical in some way to perform it."
"I can teach it - though people being irresponsible with my world's magic system can have extremely bad consequences, so I'd want to be careful about who I'm teaching it to."
"Um. I'm a little bit wary of teaching powerful magic to someone who identifies themself as a demon but you otherwise seem pretty great. Except for uh, whatever mind affecting aura thing you have going on."
"...demons don't have those. And I don't think I have picked one up in my travels. Though if I have somehow I'm very concerned, what is it doing?"
"Was that just a really weird way of asking me to put on a shirt, I can put on a shirt."
"That would be appreciated but it was not meant to be a weird way of saying that?"