Well personally, i would have liked it more at the sides too. But hypotetically, lets just say a customer insists on having it at the handles on opposing sides maybe because he/she prefers the ergonomics that way.
This is what you've got now. The "inverted Mac Ds" looks kind off odd IMO. Which is a pity seeing as the bag in general looks really prim and proper. Very old school classic English style bag to me.
This is what i was thinking. Just slip it in along with the handle and rivet them together as per normal. So whilst you save time and materials, it looks less out of place too.
Was talking about it with my girl. And she still found my idea too... Distracting.? So she was thinking of a more subtle version. Basically having the strap and the D ring placed behind the handle. Yet at the same time, above the piping so its easier to hook on the clasp.
And at the same time, when it isn't being used, you could just flip it downwards and tuck it behind the handle. Which i thought was pretty smart. This is coming from a girl who doesn't fancy D rings. Haha.!