Okay - I have it all sorted out.
Someone on the Discord Mudlet channel gave me the line I needed. If anyone here is interested: You open the alias editor, create a new alias, the pattern is simply fon, the command is lua enableAlias("FamiliarAliases"). Then create another new alias, the pattern is ...

Hello,
I would like an alias 'fon' that, when used in the main display, will unlock a group of aliases.
The group of aliases is name FamiliarAliases. This group (or folder) contains 11 separate aliases.

After reading the wiki and the and forums, I believe the actual command to unlock the group is ...