First run of DynDOLOD, select options as usual, but make sure not to select BSHeartland. Save and install. Second run, with DynDOLOD plugins in the load order, on the advanced options select BSHeartland only and do not select the Generate static LOD checkbox. Afterwards save and merge output with already installed one, overwrite any older existing file.   You could also just generate everything as usual, and then just manually delete all *.bto meshes from output in ../meshes/terrain/BSHeartland/