You can hair rig with spade end hooks but its very difficult to get the right sized hair and it takes lots of practice to get it right. I use to use spade end hooks for hair rigging before there was enough choice in eyed hooks.
Make your loop in the hair or add a band or bait spike to the end of the line. Then, do your spade end knot as normal but you have to think about how much line you have to work with for whipping around the shank of the hook and getting though the loop to the spade end knot. Its very fiddly to get it right but easier if your leaving a longer hair length. You need to work out how long the line is that your doing the whipping with and how many turns of line you want to create the knot. Almost impossible if you want the hook bait right next to the bend of the hook as there is almost no line to complete the knot.