Welcome to the forum from South Eastern Pennsylvania.
A few weeks ago I too was in your shoes, posting here with out yet receiving my W.E.
as far as your concern , W.E does make a set of rounded stones ( found on the products page. ) there is also a You Tube Video on this very subject offered by Clay ( W.E. founder and designer ) . FYI, IM 70 years old… been sharpening knives for 50 + years. IN one day the W.E. has totally changed my mind about what a sharp knife can be. AS a retired engineer, the methodology in the development of this product is genius. This system will true up any poorly sharpened edge, and also maintain that edge with very little effort , or loss of steel. When the system takes all the guess work out of repeating an edge angle trying to achieve this consistency by hand, all the faults with hand sharpening are removed, leaving you with nothing more than the sharpest edge possible. It didn’t take me but two test blades, to hone my skills using this product. I was telling someone the other day that I took a two inch tomoto and was able to make 400 paper thin slices (0.005 inch. ), using a knife I had just sharpened on this system. I never realized what sharp was until now… BTW, I learned my lesson very quickly, that you do not want to test the edge of a knife sharpened by this system, using a light touch with your finger. That’s because I never had any real respect for a factory ground edge from any knife I owned. On a scale from one to ten. knives go from 0 to 5, with most knives over the years. A newly bought factory edge might be 6 or 7, but using a wicked edge , its easy to get even a factory knife up to a 9 or ten , with little effort. IN 70 years of life, I’ve never had so much respect for what is sharp. If you think those razor blades found in a Box cutter are sharp, forget about it, they are nothing compared to a W.E. blade. I Made the mistake of testing my first knife using my finger, touching it ever so slightly, It was so sharp, I did not know I was even cut, it took about 3 seconds for the blood to start gushing.
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Bill aka ET