You should not consider community wiki for anything other than a canonical post that needs to be editable by a broader group of users. Don't use it to dodge rep gains or losses, and it doesn't magically cure intrinsic problems with questions.
Of your list, I found this to be the most on-topic:
How to handle cultural differences with your neighbours / coworkers?
And that was asked with mixed reception. Despite leaving what I thought was a very objective and reasonably comprehensive answer, it was placed on-hold as too broad.
I don't think asking for a strategy to not make a moron out of yourself in a strange culture is too broad, I think it rather illustrates the scope and complexity of real problems that we face day to day.
The third question could be good, and I think useful because transplanting your life to another continent is an extraordinarily complicated process. What documents do you need to make sure you have and bring? What medical considerations do you need to consider? What do you need put in place to manage any lingering affairs state side? How are you going to supply yourself with money if you need it? I think that could be a canonical post.
Just don't seed content for the sake of seeding content. We've got over 100 open very well scoped and written questions, we don't need to worry about coming up with more just for the sake of having them. A little broad is okay if the problem itself is a tad overwhelming and there can be a limited number of well scoped answers.
As long as you keep it to problems you are facing, or have faced and overcome, then I think we're in good shape.