The Halcyon webbing is probably the nicest on the market, but that's about the only advantage the Halcyon stuff has. If you really want it, you can buy the webbing separately, it will work with any triglide and d-ring.
Plates aren't "standard." The only thing standard about them is the hole spacing for a twinset. There's no guarantee that anything else on the plate, from other hole position to amount of bend to webbing slot location to any other "feature," is the same from manufacturer to manufacturer. There's no "standard" backplate design. Most are pretty similar, but there's no guarantee from manufacturer to manufacturer.
Plates aren't "standard." The only thing standard about them is the hole spacing for a twinset. There's no guarantee that anything else on the plate, from other hole position to amount of bend to webbing slot location to any other "feature," is the same from manufacturer to manufacturer. There's no "standard" backplate design. Most are pretty similar, but there's no guarantee from manufacturer to manufacturer.