But you can use the lines from the R32, you also need to make sure you have the bolts off the R33 as they are a different pitch to the R32 caliper. Get rid of the shield all together, its not that hard, you just need to drill out the spot welds or just tin snip and rip back and forth until the spot weld rips. Then just file off any sharp edges.
You can even use the std brackets etc with a small 10min tweak per bracket. (i run aftermaket braided lines on my R32 before upgrading to the GTR rears, so should point out that my aftermarket R32 braided lines worked perfectly with the GTR Brembo rears)