Lou,
I'm not trying to discourage you from doing something you obviously feal  
strongly about, but, the R22 is a deck step masted boat, not a keel stepped.  
There is a huge difference when you are talking about vulnerability to lightning  
strikes. 
My very personal opinion is that grounding the rigging on a R22 is a waste  
of time and materials. Your time would be better spent sailing instead of  
working on your boat.
I would recommend doing further research on the topic before jumping in  with 
both feet. As someone on the list previously stated, they knew of very few  
masted boats that have actually been struck. I personally don't know of any.  
I've seen more houseboats and cruisers zapped while tied up at the marina than  
anywhere. (metal roofs)
 
Rummy