I imagine a US adaption would go with the Wonder Woman (2017) route with the Sailor Suits and make them armored.
The Wonder Woman suit from the Gal Galdot movie has lots of pieces that would traslate well into styling and modernising Sailor Moon suits with a more realistic look. She is wearing a tiara, has a suit-armor, high boots, kind of a short skirt...
That should be the way to me. I would keep the actual skirts for the show cause they would look great in real life. Make them with a darker fabric to look more serious and not that colorful and thats it.