Sending to Mailman Announce Lists

I know how Announce Lists work & that in order to send to them you must log into the webpanel & send from there.
Does anyone know a work-around whereby I can approve certain addresses to send to an email address which will go out to the Announce list’s subscribers?

I know I could set up a Discussion List and just not let anyone post to it for this type of thing, but I don’t want the welcome emails to contain all of that business about subscribing/unsubscribing, archives, etc. It needs to be more simple than that.

I’ll be setting up a few Announce Lists for people at my organization and would like to make it as easy as possible for them to email their lists and am not too keen on them logging in & having access to any and all lists we host.

Thanks for any advice!