Yes, you’ll have to get the source, add the code above, rebuild the engine. It’s easy to do, but you need the source. Will work exactly like launcher version once your build.
EDIT: This is a bit old now, but I think the process is pretty much the same. - YouTube
EDIT2: Note that I submitted this fix as a patch for 4.14.2 so if you sit tight, might just come down automatically for you.