^^ this might have a typo. 40
dps - that's Degrees per Side, or 80 degrees inclusive. I'm sure this should be 34 -40 degrees, or 17-20DPS.
Apart from that, I would definitely recommend using a sharpie in addition to an angle cube. This will help visually verify the reprofiling creates the same height on each side. If the blade is not perfectly centered (and is tilted to one side), just matching angles may result in an uneven bevel. On my W.E. I always had to be careful of this, lest I got things uneven.
Are you looking to match the factory bevel? Are you looking to get a better performance? Are you looking to even things up?
I would start a little on the wider side, say 20 dps and see where that comes out with the sharpie. I don't own a mnandi. My sebenza likes about
18dps, which seems pretty close to the factory edge (which is a little convex to start with) and performs really well.
This edge is after a few good sharpenings on my W.E. Just a little maintenance now and then and stropping gets it whittling hairs...