> shidduch crisis for men.
are you sure that men will see this is as a crisis? You can always regulate it further by increasing age difference in the marriage. Presuming continuing high birth rate in the community, ken irbu, if men will marry at 50, then they’ll probably have 3-4 wives to support their learning, as mentioned above. Someone can do the math. More than 4 may be not OK, we need to be yasharim at least in the eyes of Muslims who see that as a limit.
Re: Mormons, I don’t think they do this openly in US, some moved to Mexico to avoid Uncle Sam/Rabbeinu Gershom issues. Maybe we can do it also, as Mexico was under Spain, so Sephardi halochot apply.