Reusable Block in Widget Position

Is it possible to code a reusable block into a widget ready position? This would then let me add rich formatting easier to a certain set of pages. The big idea that I am trying to accomplish is to add a block containing an H1 header text, a line spacer, and a social link icon display. I want this to display only on certain pages through widget display conditions and not have to edit every single page to add the reusable block elements. I have this coded on my home page already: https://www.ufcinc.com/
There may be an easier way to do this?