I have been following this but did not chime in because I have never used express. I didn't think I had anything to add, but was curious.
Now I'm not 100% on this but I'm pretty sure it works this way. You CAN edit an express font in the advanced editor. You can NOT edit an advanced font in the express editor.
Again, I'm not 100% sure. Hopefully someone with experience in both will correct me or clarify this.
I think you're right. I think I can add to this.
You CAN edit an express built font in the advanced editor. You can NOT edit ANY existing font in the express editor.
The reason I'm asking, is that I build an express font which I really like. Then I just wanted to change a couple of things but instead had to start over. Not a big deal but a lot of extra steps noting the colors of every move first just to change the one. Oh well... if that's the way it is designed.