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 custom trust lists!)