I'm pretty sure you will be able to participate as long as its after 6AM (I'm not 100% on that). Theres always a risk of losing villagers in the time travel, so if you want specific villagers in your town that you already have or that are in a certain place then i wouldn't recommend doing it. If...
Yes! I have had that many times and its always with the pig Gala. I love her though so i don't mind that she moves into my town. Sometimes I do wish there is a better variety instead of her every time, but again I don't mind. :)
RE: Villager Moving
Hello! i'm sorry to hear about Roscoe moving out! Gala did that to me once when I was time traveling. Like you said, no ping or anything!
The most efficient way to get a certain villager you want back in your town is to have their amiibo card. :) There are many places that...