If you already have a one handed slice I wouldn't bother. A problem with the two handed slice is that with both hands on the racquet, players have a tendency to "chop wood" rather than swing through it. That obviously works on drop shots, but it'd be much easier just to keep the one hander and modify the swing path a little more down and across for your droppers.
Tacos, fettuccine, linguini, martini, bikini. "if Federerer is the goat Nadal is the farmer" - Messarger