Surely you can get a red clone milanese loop off AliExpress or similar? Looks good though...
Not keen on the red sports strap as the colours don't match, might look better in person.
Your second statement is the exact reason why your first statement isn't an option!
The finish on the red body is beautiful, it's a very rich brushed anodized finish, I can't state just how beautiful it actually is in person. All my previous watches have either been in grey or black, so I went to the opposite extreme here, but when I was working my way through the colour options the moment I hit that colour I knew I didn't need to carry on searching any longer.
The issue is not just matching the colour, it's matching the finish which would be considerable effort as it's using the properties of aluminium coupled with the anodisation to produce that colour/look. For a traditional strap, this wouldn't be a problem, but it is for the Milanese because it relies on a magnetic coupling and aluminium, well, isn't magnetic.
I haven't explored other options for straps, I don't know if there's a first or third party aluminium strap that does match, but if it did, it would be a mechanical clasp or something, which sacrifices the major feature that I really like on the Milanese loop, that it's infinitely adjustable. If your watch is irritating you because it feels slightly too tight, you can adjust it by the tiniest amount, with no flipping between too tight or too loose.
There are also limited options, I know the 44mm straps will work, but I believe there is a slight difference, so I guess we'll see what happens over the coming months and whether more options appear on the market.
I'm with you on the sport bands, they're not a strap I've ever really liked, but it was slightly annoying that the fabric strap that kind of looks like a fabric Milanese loop is two-tone for the S7, no idea why they did that, the old strap looks way better in a single colour so I went for the sports band. I have a load of different leather straps here which I used on my S5, I'll have a look and see how they look, although the colours I have are dark though and blue is the only non-black or grey strap I have.
You can spend hours looking at straps as well, reading reviews, studying pictures and trying to get a good idea of what the quality is like and also how well the colours & finish are, it's only of the areas where a third party strap that costs a few quid can be just as well made as an Apple strap costing hundreds of pounds, some of those Apple straps (Hermes) are so ludicrously priced, even by Apple standards, you could actually get somebody to hand-make you a bespoke strap with grade-a materials for less, and I'm far from an Apple price basher, the stuff is expensive because it is well made and is premium.