Although it will not working on multiple lines, I thought what I found on CodePen after I stumbled upon a CSS-Tricks forum discussion maybe useful for you.
Sometimes you need to put text with ‘line-trough’, but further customization such as the thickness of the line that can be so tricky. Check this CSS, which is written by Andy Howells and its live demo on CodePen:
height: 1px; /* ADJUST HEIGHT TO ADD WEIGHT */
background: black; /* CHANGE COLOR TO SUIT */