fukk a grinder.
Best way is to make a layer bowl bowl. Get your pipe. Put a small nugget in it to use as a screen. Sprinkle your keef ontop of your weed screen. Sprinkle a nice layer of ground weed ontop of the keef. Now you have three layers. Two weed. One kief. When you smoke it make sure the lighter doesn't touch the kief directly.
If you do it that way all the kief will melt over the bud as you smoke and your bowl will last super long and get you faded.
if you're feeling wasteful you can sprinkle it on a joint.
If you have just keef but no weed you should use hot knives.