I recalled JM's wonderful terrain-surgery thread. I'm afraid to try doing that to Pleasantville this soon after a new X-pack, especially one for which there is no SimPE tool yet. (In case you haven't tried it yet, the old Simpe is totally roached with BV).
Ye Olde SimPE works fine, you just need to disable all the obsolete plugins and work in RAW mode, which is fine since Terrain Surgery requires no editation, merely cut-and-paste replacements.