I like Tileira's workaround (requires sufficient spare groups, but would be workable).
You could set it up with the first post set up as links, then subsequent posts for each section, as desired (equipment, background, skills, etc). If you want to see an example of this, have a look at the chararacter sheets thread in Heaven:
link to a message in another game
Syntax for linking to specific message is: http://rpol.net/display.cgi?gi=2&ti=21&msgpage=&show=all#1 ... gi is game index, ti is thread index (open the specific thread and look at the address bar in your browser for these numbers) and the number right at the end is the message in that thread to which you want to link.
If the GM wants to keep control, then they make the posts ... if any particular posts (or the entire sheet) should to be user editable then the GM posts those on the character's behalf (OR get the player to do those, whichever you prefer).