I would probably just run some short 6" or so hoses where you jump from frame to link or link to axle. Anchor the 5/8" barrel fittings to the links and you're good to go. When you say you need -03 AN to 3/16" male inverted flare, I assume you're referring to the 3/8-24 male tube nut on the hard line, so the fitting should be a -03 AN X 3/8-24 female inverted flare (FIF), correct?
Regardless of male versus female, I'm only coming up with about $75-$100 in fittings, give or take depending on what you do at the MC. I would put a -03 X 3/8-24 inverted flare tee fitting on each axle (2 total), -03 X 3/8-24 FIF fittings on each end of the track bar, rear upper link and out at each of the calipers (8 total), plus whatever banjo fittings you need for the calipers you're running (4 total).
Hoses, considering you'll need (2) of one length for the front calipers, (2) for the rear calipers and (4) for the link mounts assuming you tee the circuits at the axle, will certainly add up, but you should be able to do all of the brake plumbing for less than $350 I would think.