That strap is and combo is epic! I wish I could find that strap somewhere!
Yes, the Kingsman orange alcantara (suede) strap is also one of my favourites from all the Modular 45 collection 😍
But this strap was never sold separately, so to find one you probably have to buy (as I did) the full set of the Kingsman Special Edition. That way you also get the specific Kingsman black titanium buckle, and the rose gold lugs (available as a separate accessory, but at €2700 😱), so if you find a used Kingsman full set at reasonable price, go for it 😉
Man, I miss the days of the TAG Heuer Connected Swiss watch