Crank seals can be changed without splitting the cases. The timing side is easy to get at, you obviously have to remove the clutch cover and clutch to do the other side. Digging them out could cause damage, better to drill a couple of small holes near the periphery but do it gently so you don’t go through the seal protection plate and into the bearing. then insert a couple of self tappers to give the pliers something to grip on. In fact often just screwing the self tappers in pushes the seals out. I usual grind the point of the screws to stop them digging into anything delicate.
Double lipped seals are recommended for the clutch side, single lip seals for the timing side. I have in the past used ordinary seals from Simply Bearings and they probably work just as well.
Peter