Hi I am doing a little motion but it is right handed. Can I easily change it some how to make the motion left handed?

No easy way, but perhaps this would help: https://forum.reallusion.com/459858/XMirror-Invert-Clip-Script (I think you should have it already).
Note: That would invert all bones by X. Would not work not if you wish to flip selected bones in a motion clip you made.

If you go to the ActorCore motion page, and enter motion to display in the box, there is a mirror motion there that makes the motion RH or LH.
Also, if you have 3DXChange, you can can go to Mixamo Fuse, and they have Mirror motions there. Just use a Y bot to apply mirror motions to,
and send to 3DXChange to convert to use in iClone.