Salut,

If your main concern is converting pages from ISO-8859-1 to UTF-8, I think you’d better open the page in Notepad++, and actually convert the page’s encoding to UTF-8 (using the "Convert / Convert to UTF-8" menu item), instead of escaping all the entities.  Nowadays, the only entities that need to be escaped in text are <, >, and & (and in attributes: " and ').

I also have a command-line tool ‘ConvertCharset’, that can be used for conversion from any encoding to any other encoding:
[https://fossil.2of4.net/mc_tools/doc/trunk/README.md#ConvertCharset]