i acutually just got an idea(i hate those"pipe" spanners aka nut rounders)
i usually use a GOOD sidchrome shifter on the brake line nuts, tighten it once its on the nut and shock it undone, i have had to use vise grips before.
BUT! i recon if you ground flats on the pipe spanner that vice grips could clamp onto also.. would be better(if there is space)
those hard lines don't cost much to make, if you went to Campbelfield, you were near Highway Clutch and Brake at 189 Barry Rd Campbelfield http://www.highwayclutch.com.au/