AMT- just in case you check back in here...
Your gunsmith simply doesn't want to mess with the job, which you can easily do yourself anyhow. See
here for further. I think the front sights on the E are the same as the CW's, but you may want to call Kahr and confirm that. There are also at least a couple of slide types so make sure you sort all that out before you order.
Of course I could have posted some snarky comment about a simple typo, replied to other snarky comments, etc. But in 1/3 the time it would have taken to do that, I found a likely solution to your problem.
Geez, people. Help a guy out once in awhile.