I'm not all about the whole duplicate thing.
For my situation, I own a P2000. I've already preemptively bought CCC Shaggy's for both a P2000sk and P30, which I plan on buying 1 of each.....all 9mm, all DA/SA.
I think there's more than enough similarity there between the P2000sk, P2000 and P30 that I'll be just fine if one, or even two, go down and I'm left with 1 of the three for a course or for concealed carry....provided that I have the mags and holsters for each.
If I instead had a SIG 229, Beretta 92G and P2000, all DA/SA, I'd be happy too (and that's a combo I wouldn't mind owning, I've thought about switching to the Beretta 92G for concealed carry anyways).
I think having the G26 as a secondary is just fine, considering you're not taking courses or competing. The combo I used to have was the P2000 and a Walther PPS....transitioning to the Walther's trigger was obscenely easy to do. My experience so far is that if you can shoot DA/SA correctly and use one as your primary for training, then you can shoot anything with minimal loss in proficiency.
My method does not apply to insanely good shooters who are on the ragged edge of pushing proficiency, you know........the type that commits self-flagellation over time differences 1/10th of a second or less. But for me, I don't see the point of buying two of the same....instead, I can buy two guns sharing enough similarity as to switch without problems, and still have those two guns different enough to bring something to the table for me outside of simply being an idle secondary.....