It depends very much on what shape you are. I find my 2a is quite comfortable, but I have fitted late S3 high seat backs. I can see there may be problems with the swb with the back bulkhead being further forward, though. But I don't remember any comfort problems when I had an swb Series 2, although I was a lot younger then. 
Perhaps one thing you might consider, with minimal change, is to get custom upholstery on a high seat back with much thinner but shaped padding. And perhaps a similar seat cushion. A motor trimmer should be able to advise you.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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