This is a little addon for Blender 3.2 to easily convert rigify armatures and animations into game-ready armatures, keeping hierarchy intact and scales appropriate.

How to use

Installing

The addon can be installed from Edit > Preferences > Addons > Install. Then select the Zip file.
Minimum Blender version : 3.2

The addon will be in the n-panel. Select a rigify armature or any mesh attached to it to make the panel appear.

Previewing

Select the rigify or any meshes attached to it. Choose an export mode, then click Preview

There are 3 export modes 

• Armature - Only export the armature and meshes attached to it. The armature will be named ‘Armature’ by default, but can be changed in the advanced panel

• NLA Animations - Only export the armature and unmuted NLA tracks. The animations in the exported file will use the NLA tracks names by default. Can be changed to use First strips namesin the advanced panel

• All - Export the armature and both meshes and animations

After Previewing or Exporting, you must click on Unpreview before going back to working on your animations

Exporting

After previewing, click Export to export to fbx

Exporting without previewing

You can set in the addon preferences to allow for exporting directly without previewing

Example

Here is an example animation exported to Unreal Engine