Hi
Divorcing and remarrying doesn't work, here is a quote from the Immigration Regulations Sec 117
Excluded relationships
(9) A foreign national shall not be considered a member of the family class by virtue of their relationship to a sponsor if........
(d) subject to subsection (10), the sponsor previously made an application for permanent residence and became a permanent resident and, at the time of that application, the foreign national was a non-accompanying family member of the sponsor and was not examined.