[support] Separately editable page sections?

[Luke]

Hello

I am trying to allow certain portions of a node to be editable 
independently from that node.

Or, trying to allow a node to display a block of text, based upon 
something entered in some administrative section.

An example, would be a div containing special announcements, displayed on 
a home page.

I would like to have that section only be editable, without granting edit 
permission for the entire page.

I could probably do this with a view, displaying an otherwise publicly 
inaccessible node.

I could probably do it better using a custom designed HTML form, with a 
bit of PHP in the node to pull a record from the database.

Those are the two options I have thought of.  However, there are probably 
others of which I am unaware, and maybe this is not a novel problem.

Any suggestions?

Thanks

Luke