Looks like a bit of a non-problem to me – for what reason would you need it like this? It only takes maybe 20 seconds more to do it the normal way, which probably outweighs the time spent on this “problem”.
Thanks guys. Hugo is right, it’s more of an experiment just to see if there’s a way to edit it in one place.
Use case – I’m developing a new WP theme and don’t know which font to use for the headers. I may want to preview a dozen of them, but I can’t unless I have both functions.php and style.less open and change the name in 2 different places. If there’s a more efficient way, I’m always open to it.