Change 'Read More' text on Bedford blog

Site URL: https://davidbrewsterwriter.com/blog

I have a two level question relating to Bedford template:

• I want to change the 'read more' text on blog excerpts. I tried using the following custom CSS (as per other answers relating to other templates) but no luck. Bedford has a 'data-read-more' tag that I don't seem to be able to target.

a.entry-more-link span {
  visibility: hidden;
  font-size: 0;
}
a.entry-more-link span:before {
  content: "Listen";
  visibility: visible;
  font-size: 13px;
}
a.entry-more-link span:after {
  visibility: visible;
}

• If I have more than one blog on my site, is there a way to target a change like this to a specific blog? Is it the same as targeting other pages using the relevant collection id?

Thanks,

David