Yes—this is a valid workflow need, and there are Windows tools that support IPTC metadata entry. A good starting point is the IPTC-maintained list of compatible software, which includes applications such as Caption Pro, Cortex Quebec, ExifTool, IMatch, Photo Supreme, Portfolio, and STOCKBOX PHOTO. Those are specifically aimed at IPTC metadata support, so they’re the most relevant options to evaluate for keywording.

If you want more automated tagging, one community suggestion was Imagga with a sample Python script, which can generate tags for images. That may help speed up keywording, though it’s a different approach from manual keyboard-driven entry.

Another suggestion was VueScan, which supports adding information during scanning, but it’s more of a scanning application than a dedicated metadata keywording tool.

For your stated needs—Windows, fast IPTC keyword entry, and likely reuse of existing keywords—the IPTC software list is the best place to compare dedicated metadata managers and choose one with the keyboard/autocomplete workflow you prefer.