I have already endeavored to fool the Mac into believing (originally DOS-formatted) 1.44 high-density floppies are 800k disks, using rawrite for windows, stuffit, and the images on the Apple Web site. The Mac dutifully rejected every one of my disks, even after I tried taping the hole. So that won't work.

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Yes, you've (re)discovered the sad fact that, unfortunately, 800K Mac floppies cannot be written by a Windows floppy drive. The formats are so different at a fundamental level (including, but not limited to, zone-bit recording -- achieved in the original implementations by varying the spindle motor's speed) that an 800K Mac floppy must be written by a Mac floppy drive. No software cleverness can provide a workaround. So, you're right to go for Plan B and ask for someone to provide them to you.