Hello again.
No, you cannot restore the iPod from a mac, without it again formats in mac-format!
.....unless you can run windows from your mac!
I have windows 7, running virtually (with Parrallels desktop). I started windows, installed itunes and restored the iPod. Then I closed windows and ran the rockbox utillity with success!
Thanks a lot for your help.
All the best
jbrandtp