Already ahead of you on the first one. Even easier, just add you to my trust network and let you do the work for me 
That works for your view, but since you're DT2 the exclusion through me will be DT3 to the rest of the forum.In other words, you'll have to exclude him yourself if you want to exclude him on DT2.
(Until today, I never understood this implication of custum trust lists!)
My understanding was that DT2 trust lists don't impact the rest of the forum (in terms of DT) unless their depth is higher than 2. Whether I exclude him via adding you to my custom trust list, or directly on my own list, the outcome is the same for others (unless they have a custom depth or trust me directly).