The sextoblade is one of my favorite razors. It probably gets used the most out of all my razors. As has been said the old weck blades are hone able. They really take a nice edge very easily. I always start on the 4k with them. Then 8k and finish on a surgical black ark. Leaves a very nice edge. The blade geometry is perfect for honing the blades. If you need to majorly re work a blade I would recommend taping the spine to protect it. As to learning to hone with the sextoblade I would say its a good option it responses similarly to honing a Frameback razor. Also if you look around you can find all different blades from complete trashed to nos to play with for relatively cheap

As to current production hair shaper blades I found the most cost effective were Diane hair shaper blades from japan. Got them on amazon forget the exact price.