Remove the swingarm? For a brake line? Please put down the wrench and step away from the bike.
Now, why would you think you'd have to do that? First off, the brake line connects to the rear master cylinder. There is a banjo bolt on the top connecting the line. And the master cylinder screws to the rearset. So, there should be no reason you can't unbolt the MC from the rearset and leave it alone. It will just bolt the R&G rearset like the OEM. Shouldn't have to remove the brake line at all. So I'm not sure why you'd think you'd have to remove the swingarm for any reason trying to put rearsets on the bike. Should take about 30 mins or so to do that job.