I read about using a milk frother for mixing.  I happened to come up on some cheap ones at ikea.  They are $2.50 and take two AA batteries.  It was very good at mixing. (This is 100 ml in a beer glass.)
Before
		
		
	
	

During

After ~1 min of frothing

	
		
			
		
		
	
			
			Before

During

After ~1 min of frothing
