A picture would help portray how bad of a situation you have.

Before going the chemical route, I'd set the hot end on piece of plywood and use a hot air gun to warm up the PLA so it can be peeled away using something like wood craft/popsicle sticks with the end cut square. Take your time - the thicker the PLA is, the longer the time needed to get all of the PLA soft. Some have used a blow torch for issues like this, but IMO it's too easy to overdo the heat with a torch.

BTW - the e3dV6 rubber boot thing is fairly new. There's a lot of e3dv6 documentation out there that doesn't mention it.