Actually imo almost any character that can melee can kill ubers,with enough crushing blow and open wounds.Lifetap from lastwish or dracs gloves is a must,so is very high attack rating.Gold resists in hell,with about 100 extra points of stacked resists also helps.Zealers,kickers,smiters,concentrate barbs,frenzy barbs,shapeshift druids(rabies is beautiful against swarms)and just about any other melee character can be setup to solo uber trist,but the resulting builds are very cost prohibitive.The best way to find out if a specific build is at least somewhat viable is to build the character using hero editor,and play with it on single player using the plugY mod.