Am not fully aware of your issue, however if you are mainly having problem with using ssi on .html page, than you can try adding below lines in .htaccess file and your .html files should be able to process ssi codes.
AddType text/html .html
AddHandler server-parsed .html
AddHandler server-parsed .htm
Hope this helps.
Vishal
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AddType text/html .html
AddHandler server-parsed .html
AddHandler server-parsed .htm
Hope this helps.
Vishal
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