What do you have ready so far ? Or are you still in the planning phase ?
Many of the locus helmets have those typical white/silvery stripes going on. I'd try to make advantage of those if possible and see if I could put some kind of see-through foil/material there that blends in with the said stripes. Just my idea.
Yep. Or look at Marawuffs' Palmer armor. I liked what she did there too.
If you can live with silver instead of white, cutting out the needed shape out of a cheap silver tinted motorcycle visor, and match the color of the helmet markings accordingly. That would give you the easiest option to match visor and markings in a manner that allows you to integrate the visor ports as invisable as possible while maintaining the best possible visability for the wearer.