Have you tried to join all the meshes you need in a single object and then using the recent voxel remember to turn them into a single surface? It requires no ex

Have you tried to join all the meshes you need in a single object and then using the recent voxel remember to turn them into a single surface? It requires no extra addons and you can choose how detailed you want it to be. After joining all the meshes, select the object and go to the object data panel, as visible here: https://docs.blender.org/manual/en/latest/modeling/meshes/properties/vertex_groups/assigning_vertex_group.html https://docs.blender.org/manual/en/latest/modeling/meshes/pr... From the remesh section, you can choose between the voxel remember and the quadriflow one. I think the Voxel one might suit your needs.