generated exploded combined mesh for selected to active bake blender

join_meshes.py

import bpy

lp_meshes = [obj for obj in bpy.data.collections['lp'].all_objects if obj.type == 'MESH']

bpy.ops.object.select_all(action='DESELECT')

for obj in bpy.data.collections['bake'].all_objects:
    if (obj.type == 'MESH'
    and obj.name not in ('combined_cage', 'combined_lp')):
        bpy.data.objects.remove(obj, do_unlink=True)

bpy.context.scene.frame_current = 30

copies = []

for lp_mesh in lp_meshes:
    copy = lp_mesh.copy()
    copy.name = f"{lp_mesh.name}_copy"
    copy.data = copy.data.copy()  # need single-user mesh data to apply modifiers
    copy.parent = lp_mesh.parent
    bpy.data.collections['bake'].objects.link(copy)
    copies.append(copy)
    
    copy.select_set(True)  # select for future join
    bpy.context.view_layer.objects.active = copy  # activate for modifier ops
    
    # apply all modifiers
    for mod in copy.modifiers:
        bpy.ops.object.modifier_apply(modifier=mod.name)
    
    if copy.parent is not None:
        world_loc = copy.matrix_world
        copy.parent = None
        copy.matrix_world = world_loc
        
    # add a vertex group for the mesh
    bpy.ops.object.vertex_group_add()
    added_group = copy.vertex_groups[-1]
    added_group.add([v.index for v in copy.data.vertices], 1.0, 'REPLACE')
    added_group.name = lp_mesh.name


to_join = copies[-1]
bpy.context.view_layer.objects.active = to_join
    
bpy.ops.object.transform_apply(location=True, rotation=False, scale=False)

bpy.ops.object.join()
joined = to_join

joined.keyframe_delete("location", frame=1)
joined.keyframe_delete("location", frame=30)

joined.name = 'script_joined'
joined.data.name = 'combined_lp_mesh'
joined.parent = None

bpy.data.objects['combined_lp'].data = joined.data
bpy.data.objects['combined_cage'].data = joined.data

bpy.context.view_layer.update()