Fully Mac-compatible non-bluetooth (wired, USB) keyboard?

Apple doesn't make them any more, but you can still find them on Amazon and eBay among other places.

https://www.amazon.com/Apple-Aluminum-Keyboard-MB110LL-Refurbished/dp/B078YG84MN/ref=sr_1_8?keywords=apple+keyboard&qid=1583448815&refinements=p_89%3AApple&rnid=2528832011&sr=8-8

FWIW, I would stick with a keyboard designed for Macs. Windows keyboards are unlikely to be able to toggle the Function Key options. Logitech, Satechi and Macally are reasonable choices. If your Mac is new enough, the Apple Magic keyboards act as USB keyboards with the Lightning charging cable plugged in.

There are various vendors with Mac-focused keyboards.

Here's one of the better known vendors: http://matias.ca/products/

There are others: https://www.imore.com/best-mechanical-keyboards-mac

Hello, Gerben Wierda.

Just about any keyboard will work on Macintosh. I would buy a brand that you are comfortable with that has the quality durability and feel that you want.

Then I would have a look at this support document regarding Win keyboard key equivalents on the Mac:

Windows keys on a Mac keyboard – macOS User Guide