there's a hackish way of adding a swing rhythm to a song without having to rewrite it all from scratch; it involves messing with the tempo command constantly
though, which unless you have a proper drumline or bassline would be a hassle to make work. in your example song it seems like that wouldn't really be a problem, though, since it has a steady percussion.
it'd look something like this:
you can control how much swing it can have this way, but it also means it's harder to nail the proper tempo. and you have to spam the tempo command like i said before.