I just want to state for the record that this is something I am considering doing, not something that I have already done.
This site has a lot of interesting questions on it and I'm considering picking some especially interesting ones (especially ones without an answer), sharing them with my friends, and uploading what we come up with.
To avoid taking credit for work that isn't entirely one's own, the best one can do right now is community-wiki their post and include some kind of disclaimer at the top.
I'm wondering whether there's an acceptable way to make a "club account" for these situations if you announce that something is a club account and agree to abide by certain restrictions, such as not asking questions or observing ban sentences if the club account becomes banned.
I have searched Meta and come across this question and this question, but those don't really have a definitive answer. They have answers with differing levels of support, but not really a policy articulated as such.
One example of a policy might be no shared accounts, this is a policy inherited from Stack Exchange, not a Math Stack Exchange-specific one. This is actually what I suspect the current policy is, but I figure I would ask to make sure.