How can I permanently edit a skeleton's rotation in the editor?

It seems a number of assets from the marketplace including at least one Paragon character default to facing down to the Y axis. This results in little annoyances all over the place. For instance it breaks the direction when using ‘view character in front/back/left/right’.

It’s easy to rotate the skeleton in the editor, but I can find no way to actually apply these changes to the bone/skeleton.