Two comments first.
One, I am not judging whether you should or should not. That is up to you.
Two, this is the way I have done it. It is not necesarily the only way.
In my view, succesfully removing long rivets is totally a matter of skill. Before starting, you should be comfortable drilling out short rivets from across the room with your eyes closed, and not be able to tell there was ever a rivet in the hole.
The rivet body will be tight in the hole. You will very likely need to drill most if not all the way through the rivet with a 1/16" or 3/32" in order to remove enough pressure to tap it out.
Use standard techniques to properly and cleanly remove the manufactured head. As stated above, drill as far as you dare into the body with a 1/16" and follow it with a 3/32. Try to punch the rivet body out with a small pin punch.
If it is really stuck, and you can get to the shop head side, you can centerpunch the shop head and use proper techniques to remove the head and repeat the body drilling to join (or get close to) the hole previously drilled from the other side. I try to leave some metal in the rivet body for the punch to bear against.
Take your time and work accurately. I have removed -12s succesfully so it is possible.