Now that Bethenny Frankel has closed the book on her seemingly never-ending divorce from Jason Hoppy, she’s focused on a new happily-ever-after plan. Bethenny and her banker beau, Dennis Shields, “have been talking about having a child together via surrogate,” an insider exclusively tells Life & Style. Bethenny, who’s Mom to daughter Bryn, 6, “is about to turn 46 and she’s not delusional about wanting to carry a child at her age. But Bethenny has always wanted a sibling for Bryn.” Not everyone is on board with Bethenny’s baby plan, though. Her estranged mother, Bernadette Birk, is strongly opposed to the idea. “I think it’s stupid, because she can’t even take care of [Bryn],” Bernadette tells Life & Style, adding that after Bethenny suffered a miscarriage at age 41, she…