There are several ways to connect QuickDraw printers to Ethernet. The easiest way would be to use an Ethernet bridge designed for this purpose, as built from Apple especially for the StyleWriter and from Asante or Farallon. The next easiest way would be to set up another Mac conected locally to the StileWriter and to share the StyleWriter. Both methods have a major drawback: you must have a specific QuickDraw printer driver software installed on any machine that should print on this printer -> NoGo for Windows.
There is at least one other option out there: If you have a Macintosh computer to be used as a print server, something interesting would be possible: use a software Raster Image Processor like TScript. This software runs on a computer locally hooked to the StileWriter and spoofs a virtual PostScript printer to the LocalTalk net. The printer would be connected using the Mac's serial port, while you could run the LocalTalk net using a 10baseT connection. There are still cheap LC-PDS ethernet adaptors available on ebay one could use for the Performa 400. With the Performa 400 you propably would have some performance issues if you wanted to print high resolution greyscale output, however. The Quicksilver (which should have an Ethernet connector but might need some interface card or dongle to provide a serial printer port) would be a good machine to run TScript using some classic Mac OS (7…9).
TScripts provides the by far best output capabilities you can have on a QuickDraw printer, as it properly translates vector graphics to a bitmap for the QuickDraw printer. Unfortunately you have a new challenge when trying this solution on a mixed network environment: run LocalTalk on Windows and find a LaserWriter driver for Windows …
Did some comerade successfully try to connect a Windows machine to a LocalTalk network?