New answers tagged pronunciation
An excellent resource for answering questions like this is 漢字古今音資料庫 at http://xiaoxue.iis.sinica.edu.tw/ccr/. Unfortunately it doesn't have Song or Yuan reconstructions, but it does list the 攝, which is a Song era classification. 祯 was in 梗攝, and 蒸 was in 曾攝 so they shouldn't have been complete homonyms. The difference, however, was probably in the vowel, ...
I tried the 漢語方言大辭典, and there are many places with the fu pronunciation in the southwest mandarin area, for example 佛豆 (= 蠶豆, fava bean) is pronounced fu tou in 畢節; 佛瓜 (瓠瓜 gourd) is pronounced fu gua in 自貢, etc. Not really surprising; 弗 is fu in Mandarin.
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