Your XW is completely rigid and not willing to budge at all, even if it means better health for your sons. MY WH is a seflish, egotistical marcassist but even he would jump on the chance to 50/50 parent if we divorced. Heck, he was discussing filing for divorce while he was moving down here. (he left a more lucrative job to move down here with the thought that our marriage was dead so he could be near the kids)
What I am saying is your x-wife cares about herself first and those boys last. I don't think it would be in their best interest to uproot, move to another country to live near someone who loves her ego more than her sons.
M 10yrs T 13yrs BD #1Oct 2015-PA between WAH and COW BD #2 April 2016-WH resumed PA, she broke it off Jan 2 2017 WH says he wants divorce April '17-Letting go 2018 D busted DD8, DS6, DS3