i think you can do it in a roundabout way
i have a lisp file i use to automatically load net apps during every autocad sesion
something like this
(command "NETLOAD" "C:/Program Files/Design Applications/CAD Applications/AutoCAD Addons/.NET/OsnapzBG2010x86.dll")
(command "NETLOAD" "C:/Program Files/Design Applications/CAD Applications/AutoCAD Addons/.NET/PL2MPG.dll")
(command "NETLOAD" "C:/Program Files/Design Applications/CAD Applications/AutoCAD Addons/.NET/PolylineEdit.dll")
(command "NETLOAD" "C:/Program Files/Design Applications/CAD Applications/AutoCAD Addons/.NET/Purge Tool.dll")
(command "NETLOAD" "C:/Program Files/Design Applications/CAD Applications/AutoCAD Addons/.NET/QuickSaveAs.dll")
(command "NETLOAD" "C:/Program Files/Design Applications/CAD Applications/AutoCAD Addons/.NET/ret.dll")
in my config, this lisp file is named netloader.lsp
in my acad.lsp, i have a line that loads the file
Command ( Load "C:/Program Files/Design Applications/CAD Applications/AutoCAD Addons/.NET/netloader.lsp")
neither of these files has a command, but i think its the same basic idea
if you were to write a lisp/script file that loads the net assembly, then another file with a command that loads the er loader , i think that should do the trick
not sure if this is what you'e looking for, since it still incorporates netload. . .