Gladius fix parents

stage1.py

import bpy
orig_arm = bpy.data.objects['Armature']
bpy.context.view_layer.objects.active = orig_arm
bone_collection = orig_arm.data.collections.new('Orig')
bpy.ops.object.mode_set(mode='EDIT', toggle=True)
orig_names = []
for b in list(orig_arm.data.bones):
  orig_name = b.name
  orig_bone = orig_arm.data.edit_bones[orig_name]
  bone_collection.assign(orig_bone)
  orig_names.append(orig_name)
  nb = orig_arm.data.edit_bones.new(orig_name + '_fix')
  nb.length = b.length
  nb.matrix = orig_bone.matrix
bpy.ops.object.mode_set(mode='EDIT', toggle=True)
bone_collection.is_visible = False
for name in orig_names:
  bone = orig_arm.pose.bones[name + '_fix']
  constraint = bone.constraints.new("COPY_TRANSFORMS")
  constraint.target = orig_arm
  constraint.subtarget = name
for obj in bpy.data.objects:
  if obj.type != 'MESH':
    continue
  for g in obj.vertex_groups:
    g.name = g.name + '_fix'

stage2.py

import bpy
armature = bpy.context.object
actions = list(bpy.data.actions)
latest = len(actions) - 1
for idx, a in enumerate(actions):
    orig_name = a.name
    armature.animation_data.action = a
    bpy.ops.nla.bake(frame_start=1, frame_end=int(a.frame_end), only_selected=False, visual_keying=True, clear_constraints=idx == latest, bake_types={'POSE'}, channel_types={'LOCATION', 'ROTATION', 'SCALE', 'BBONE'})

    action = bpy.data.actions['Action']
    a.name = f'{a.name}_orig'
    action.name = orig_name
    action.use_fake_user = True
    bpy.data.actions.remove(a, do_unlink=True)