If your going to eliminate the asterisk web page, perhaps in your wizard you could allow for a 'Other Provider' Button. So those who didn't use these perticular providers could enter there own. At least with version 8.10 I was able to point that linuxmce-asterisk to my currently running version of FreePBX to which has all the bells and whistle already configured. so i didn't have to redo all that works.
While I'm suggestion things, perhaps a another possible automation tool as well, perhaps have a modules that tries to discover is there is already a asterisk server or other simular pbx on your network so it would, just integrate that one in?
PS: Posted, Don't get mad, These are just suggestions. in hopes to improve, not to critic you or anyone else.