That's the easy button, at least, if Cyl & Slide can come up with more rear sights. In reality, any rear fixed sight that is free of sharp and snaggy corners should do fine.
To whatever degree they may have sat around unsold, I'd remind the critic that we were in the middle of a massive economic downturn in 2009-2010, probably the worst time to try to sell something like an extra-content Scandium revolver in the last 35 years. Even at that, there were a lot of people who tried to buy one of the 576 that were made, and couldn't find one.
I'd really like it with the barrel just a little longer, to accommodate a full-length ejector rod...since the aluminum barrel shroud doesn't actually fit in most K-frame holsters anyway.
And I wouldn't be totally unhappy with a 365 version.
The fact that just over half a thousand Scandium K-frame revolvers have ever been built is frankly an absurd reality.