I might be late to the party, but my understanding was that the flow of hot exhaust gases into the mudflap was the cause of the problem... not the mud flap touching the exhaust pipe proper. In other words, heat shields on the pipe itself is not a viable solution. 
I've got a brand spankin' pair of flaps to put on my 90, but sitting tight until I can work out a way to make it work long term. 
Anyone involved in HSE / OHS would have heard of the heirarchy of control. Basically the order of operations for solving a problem (in the health and safety sphere at least). Same principles apply with other problems too

The key would be to eliminate the cause of the problem to begin with- relocate the exhaust pipe to a side outlet, or remove the mud flap. There may be legal reasons / issues with this, and not really practical - a car cannot run without an exhaust pipe, for example. 
Then you could substitute - consider a different mud flap material perhaps?
Engineering controls like heat shields are the next step, keeping hot gases away from the burnie stuff  .
.
As for attaching to the mud flap... probably just some chichago screws
 
				
			 
			
		 
			
				
			
			
				-Mitch
'El Burro' 2012 Defender 90.
			
			
		 
	
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