Just some food for thought.
I am an IT Consultant and I'm also responsible for all administrative work and teaching at my dojo. As a result, it took a VERY long time before I got the time to put up our website at a free hosting area.
The problem is I have to really set aside a chunk of time to update the website, otherwise it doesn't happen.
You're idea is great, but I don't think that your wish for a minimal time outlay is realistic, especially if the idea takes off and you have a few websites to deal with simultaneously.
May be better to offer the hosting, not necessarily the updating.
Just my thoughts.