@willem0 Thanks for the reply. Much appreciated.
My fear is that you are correct in suggesting each site can only have one default ‘Start’ page. Intuitively, that would certainly make sense to me. I may temporarily rename the index.html file to something like index.html_old and see if that allows WP to display what is built there.
And I agree it would be ideal to have had the WP install in a sub-directory…though I’m skeptical that would resolve the current issue.