brake line/banjo bolt seized

So I've been attempting to replace pads and rotors on my truck and have been hitting the WORST luck you can imagine. I've ran into road block after road block starting with having to buy a new 200$ floor jack, to buying specific tools to get at everything, to buying two new calipers and after a couple MONTHS the circumstances lined up (weather and time) where I said "today's the day, there's nothing else I need to do this job and went to it.
I got to the brake line and went to take it off of the caliper. The nut/banjo bolt is seized and will not move. I only had metric wrenches and the 10mm wrench fit sort of lose so I didn't reef on it. As I was trying to turn it, the ends of the nut were starting to round off so I stopped. I got my propane torch and tried heating it a little bit but didn't feel comfortable getting the nut red and damaging the connected hard line or something.

So what are my options here? Taking the caliper off, leaving the banjo bolt in the caliper, and disconnecting the rubber hose above the caliper on the side closer to the engine? Or should I get a vice grips and thrash the nut off?

I'm trying to keep this a diy project but it's looking more and more like I'll be making an appointment for my local off road shop

I'm open to anyone's input on this silly problem, thanks everyone!

 

Anytime I brake the banjo bolts free I assume I am going to have to replace a line. Anytime I don't have to replace the line I consider myself lucky. Things are even worse these days with the new plastic coated lines. If you have those I pretty much consider it guaranteed I have to change the line. (I refer to where hard lines go into the rear wheel cylinders etc).

Now if we are talking the flex line to caliper those are a little more forgiving. But if you have a new caliper and can buy new banjo's ALWAYS replace the banjos. Drill the old bolt out without damaging the hose end and you are set.

Now which fitting is it? Take a picture.

 

I'm assuming w/o seeing it that there is no way to get a 6 point socket in place? Of the correct size of course?

Do you have flare nut wrenches? A combo set of those (metric and SAE) should find the right fit. And they are must haves for things like the master cyl, rear wheel cylinders, etc.

At the worst, since you have new calipers, you just buy new lines to go with them, or replacement banjo bolts/washers if you can remove the old one w/o damage to the line.