I think typically the powdered steels are harder than non-powdered steels, and I'm thinking the Mac's blade isn't as hard if the thinner edge is rolling like that. So yeah, a thicker edge bevel and maybe even a micro bevel (couple of swipes at a higher angle) might help strengthen it a little. You're probably wanting a harder steel that can take a thin edge but not roll. The only issue with that is because it is so hard, it can chip instead of roll.
My guess is that if you want carbon steel, maybe a good choice would be something in Aogami Super, or Blue Super, steel. I've seen blades hardened to around 63-64 Rockwell with it which is pretty hard and seems comparable to the SG-2 offerings on the site. I think tool steels are usually pretty wear resistant, so even at the same hardness maybe the Aogami Super would be easier to sharpen. It might not hold an edge quite as long, but at that hardness I don't know that it will be a huge issue. Keep in mind I don't know anything about SG-2 steel, just going on what I have seen with other powdered tool steels. lol
If you use a pinch grip where you hold the blade between thumb and forefinger (three fingers around the handle) and don't like the abrupt feel of a wa handle, chances are you won't like any wa handle unless it is something similar to Shun's seemingly hybrid/westernized "wa" handles that have a bolster. I have my thumb and first two fingers on the blade and wrap the last two around the handle with my pinch (might be weird, but it is what I do lol) so the transition doesn't bother me as I am a little further out. I'd say stick with a bolstered knife/western handle if that is what you like. There is no shame in that.
Of course there is also the option to get a ferrule-less wa handle and sand the transition down a bit until it is comfortable so there won't be a 90 degree angle between the handle and blade. That might help as there do seem to be way more wa handles to look at than western handles in that range. If nothing else, ask one of the "handle masters" here on the forums to come up with something and re-handle the knife. lol It would truly be one of a kind then.