You would get some parasitic reflux yep, would loose a little flavour and you would want to be very carefull to use a well cleared wash - if you packed your lyne arm and overfilled with an on the grain that puked, then (as i understnad it)
potentialy you could block the arm with puked grain caught in the packing turning your still into a bomb.
Not to say you couldnt or shouldn't do it. Just think it through carefully and make any necessary changes to still design (include a pressure popper) or method (only run a well cleared wash).
