For future reference I was able to achieve behavior similar to Aspose Words 19.1 and earlier by resetting the altName of the FontInfo class as returned (iterated) by the FontInfoCollection. This by itself was insufficient however. I then had to call Document.updatePageLayout to force Words to account for the changes made to the altName of each FontInfo.
You might suggest this work-around to other customers should they encounter the same problem we did.