Frankly, it would be much simpler to create an Email address for each Carvey. The students would log in as the Carvey and not as themselves. They really don’t need to all be in Easel at the same time. It would be easier for them to design their projects in something more like Inkscape or Correl and then use SVG imports to create their final GCode.
I have two grade school aged children. When my daughter was in 2nd grade, I let her use my Easel account to design her own wooden Valentines day decorations. If you want some projects that are appropriate for your students, I could probably help you. If you have a 3D printer in your class I’m also “openscaddad” over on Thingiverse.com. There are some small fun projects there.