Don't have a chart handy but I seem to remember that if you can't fly the RNAV approach you go to the GVA VOR to change to a conventional nav arrival? In the event of radio fail I'd do whatever the chart savs, but would probably make the approach using conventional VOR/DME/ILS from GVA. In the mean time I'll have my mobile on trying to phone that number in the book for radio failure. Mind you, you'll probably get 20 different answers now!