One of the tricks could be swapping the PSD"s If the new character has the same structure as the existing one (number of bones, layers, names...), save the existing one in a new folder through the Gather media option, swap the PSD there with the new character's PSD and save it. Moho should do ...

So, I did my first rig and was quite proud of it until I found out I want to separate hair strands on my character and move them all to different layers. So, I redrew it again, saved PSD, imported it again into Moho... only to find out I need to redo my rig from the beginning because it's now an ent...