After wondering about a decent rear recovery point on my towbar equipped T2 I found
http://www.watling-towbars.co.uk/imports.html and e-mailed them about making a receiver type of mount in order to fit a shackle, and this would be fitted to replace the swan neck fitment.
And here it is:
Thats a 3.25 tonne shackle BTW
The principle could be applied to any 4x4 with a swan neck type towbar fitment. Although it looks like it ruins rear departure angle I had the length made to mean that if the vehicle is stuck I shouldn't have to be digging around under it too much to get a tow strop fitted.