http://www.roadraceengineering.com/eclipsetech/icpipebead.htm
Try this technique for a cheap alternative. i have also seen where a bump is welded onto the top of the vicegrip jaw and a cutout is made on the other jaw and then clamped to form the bead by going around the tube.
Usually you arent supposed to seperate the calipers in half. Big no-no. I'm a porsche tech and when brakes are done the hard line mounts are unbolted and the caliper removed from the wheel carrier and hung aside securely. Most of our brakes now are 1 piece monoblock but the older cars are 2 piece.