The form/tool is available from my Cloud9 IDE account as follows:
I've used it for quite some time in a number of ported projects, some of which are listed in the article, so I know it works well given my own circumstances.
There's a lot more still to consider though, so please feel free to add your thoughts if you have any. I'll be keeping an eye on this thread as well as the comments on that article (comments are done via Facebook to simplify login/validation).
I'd love to see this type of thing built into the export process, so if I can be of assistance to that effect, please do let me know!
3-30-2012 UPDATE: I've just updated the tool so it now asks for height and width and includes that in the output canvas. I couldn't easily regexp search the original c2runtime.js for height/width, especially since dimensions are per-layout, so I've just added it as a setting in the tool's page.
3-15-2013 UPDATE: Form now available from my Cloud9 IDE account, as the website's currently down. Incidentally, Cloud9 is blazingly faster than my previous host, so it's much quicker to use.