Update: My epoxy putty didn't work 100%, but it slowed the leak, returning a bit of brake pressure. I drove it home and didn't touch the brakes once anyway so no problem!
But I'm excited about how cheap it is to do the hard lines if you don't buy a $200 pre-bent line kit. And thanks for the other suggestions, I'll probably try them out for fun long before I redo the full brake system.
94 YJ, 2.5L, 5sp Sold.
97 TJ, 4.0, 5sp Sold.
01 XJ, 4.0, Auto