I'm not especially worried about the bracket guys - look how thick the aluminium is there, I've only taken it down by about 2mm (+ the 2mm 'bump' that is on top, and I've got 5mm steel in it's place). Most of the force will be through the front bolt, as that will hold it from being pulled backwards, the rear bolt will keep it lined up, and provide a bit of strength.
The hydraulics issue was being caused by the pads actually being sat funny, so that whenever the brake pedal was depressed it'd push the 'bottom' over, but not the 'top'. My brain wasn't tip top that day, so I noticed the problem, but not the cause. Yesterday I fixed that problem in about 5 minutes. It just needed a fresh pair of eyes!
So - there's no hydaulic problem. You just need to do a little chopping - up to you whether you do the bracket or the caliper, then make a very simple caliper bracket with 2 holes. Et voila! (I have a spare standard bracket here at home, and more 5mm steel, so I can easily remake it sometime, neater)