I would probably just go all the way. Get the big brake kit, new lines, new metal pipes, entirely new brake system. That would be really nice. I don't think the rear pipes are that hard to replace. The dealer tech I think lied to me and said he would have to drop the entire rear subframe and the entire fuel tank, but I think you just have to drop those plastic covers as for the fuel filter and the pipes are right there.
I need to do what you describe to mine one of these days, I just dread working under the dash on the pedals, as it causes me to get strange muscle cramps in my back and rib cage.
The pressure bleeder is really nice, though I still had to do it four times, the rear lines are very hard to bleed on these cars. It wasn't so bad on F30 and E36.
The service function for the pump tells you exactly when you have to do it, and it's not all that often, really just replacing the pump or opening those lines.
I replaced the old rubber collapsed hoses with the stainless lines by Goodridge from FCP Euro and they're ok. There was a copper sealing washer, but the fitting bottomed out long before crushing this washer. A little concerning, but it doesn't leak.: dunno:
I do have my stock front calipers sitting here, good for a rebuild, 130k, if you or anyone wants them for rebuild. I went looking for them the other day and I think they're in the other bin. I don't want to throw them away, just cover shipping.