Since you are several steps ahead of me in your 226 build, I really appreciate your updates and warnings!
I just went out to my workbench and it looks like I got lucky and dodged this problem. It turns out that my right side crankcase is already bored out for the kickstarter gear assembly (Thank you Mr. Yamaha !).
And the kickstarter gear assembly slips right in.
I don't know if this is important, but this is what the opposite side of this bore hole looks like. There are two different diameters and it is not bored completely through the web in the casting.
p.s. I will be pulling that starter today and will get it mailed off to you this weekend.