A raised thumb ramp will NOT stop a blade from rotating into a log that is being split. If you are splitting a log that is too large then this will ALWAYS be a potential problem
no, it won't prevent the blade from rotating, but it will protect the handle when the blade rotates. Again, maybe it wasn't the clearest because I am typing on a phone, but the point I was making is that, since the SOD has no guard on top, the thumb ramp is enough to protect the handle if the blade rotates - if the blade spins, the first thing to make contact with the log is likely to be the thumb ramp, and not the res c. With the regulator, all I think you would need to accomplish the same protection with the guard on top would be to add a protrusion of metal in front of the res-c, similar to the one in between the choil and handle on the sod. Since the blade blanks are probably already cut, this might be impractical, which is why I also suggested the battle guard style with a separate piece of metal. This is most likely what I will try to do with mine if I ever get around to modding it.
And I also regularly baton with knives that are too long to hit the blade on both sides of the log - Andy described most of the best techniques for dealing with a stuck blade, but I usually just muscle it back to straight, and give it another whack on the tip.