[xwiki-users] Creating XWiki Objects as Guest

Hi all, I want to create a form element to allow members of the general public to enter information into a form and then have it stored in objects within the wiki. So far, fairly straightforwards. My problem is that I don't expect random members of the public to have accounts on the wiki. As such the objects are created using the XWikiGuest account. Which is where I hit my problem. Guest needs edit privs on the page in order to add the object. This means that they can also view the objects created. Given that we'll be storing potentially sensetive information in there (telephone, email address etc) I really don't want people browsing through it. I tried using $xwiki.getURLContent(url, username, password) but xwiki auth isn't "simple"! My next plan was to temporarily authenticate with a dummy user account via a plugin. It looks like I can provide credentials with $xwiki.checkAuth(). But I can't see how to remove them again at the end of the transaction. My short term fix has just been to email the details to the relevant people and get them to enter the data in by hand, but this is far from ideal. Anyone have any ideas how I can approach this? Cheers, Adam