The listed fork comes with a compression plug. A nice thing about threadless stems is they can be used either way, ie mounted one way for a flatter stem,
and flipped over for a riser stem. Don't be too quick to cut the steerer tube, some thought or perhaps informed advice should go into determining the
mini-max length of the steerer. You can also use this as an opportunity to optimize housing length off the bar. Many bikes (IMO) have excess housing as it
is a LOT of trouble to optimize the housing length to just the right curve and angle of approach to the frame, but worth it for the appearance.