Enabling SEXTANTE toolbar in ArcGIS for Desktop?

I've written to the SEXTANTE team to ask about this issue. This is the response I got:

Other people have reported that those "tricks" that worked for 10 do not work for 10.1. We haven't tested it, but there are plans for doing some development on the ArcGIS version in collaboration with a team from an american university, and definitely that's our priority, to get rid of that problem when installing.

I'll update this answer when they've fixed the issue.

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UPDATE 15 Feb 2013:

I just checked this page again to see if there has been any update and I get a 404 error. Looks like they've pulled support for ArcGIS for the time being.