I've been thinking more about what I would actually do with this Imagewriter II, if I got everything working. I mean other than print some test pages and say "gee, that's neat", and bore my kids with tales of Print Shop banners. The most interesting application I could think of was to print the invoices and labels for items people buy at the BMOW store. Since people are buying retro computer hardware, it might be fun if the invoice they receive with their hardware were obviously printed on an old impact printer. Maybe I'd even put something at the bottom of the page like "this invoice was printed on a 1985 Apple Imagewriter II".
To do something like that, I don't even really need a printer driver. My invoices are already printed from custom software that I wrote, and they're mainly text, so I could just spew that text to COM2 instead and have it print on the Imagewriter. For bonus points, I could spend some time learning the Imagewriter escape codes and try to embed a logo or other graphics in there too. But I don't think it would need a full-on printer driver.