I’ve recently seen the Clic 16 in Etoupe on the website. It’s a very nice neutral. Maybe try stalking the website? I agree, I think it is perfect.
I too was looking for a slightly bigger WOC with silver hardware and all the same criteria you mentioned. Except I have one more.....I want a zipper closure, not flap. I have given up looking! I’m using a Coach noa crossbody with brass hardware. It’s not gold, but still yellowish. Sigh.
Etuope is nice! However, the bags and colors in stock are different between different countries. In my country we only have it in Rose été, while the french website have it in black aswell (and with two different metals). But I'll try to hunt it down

Feel your struggle! I also prefer a zipper but it's not super important. Otherwise, I might have ended up like you. Let's hope for a silver trend in the near future!
I've been looking at the Bottega Veneta Mini Messenger bag (no visible hardware) but I'm not sure about the grey color, and it feels a bit large.