There is NO problem changed speeds with a Beogram 4002 or 4004, just push the speed button, and you are there. 
 
Conversely, if you have a 7” record that requires 33 1/3, just press the 33 button and you will be at the correct speed. 
 
Everything in life should be this easy! Enjoy your Beogram 4004…. I certainly do mine! 
 
Jeff