The best way is to crack concrete and tap into the drain below the floor. Raising the toilet always looks like an afterthought handyman's solution. While not my favorite, something like a Saniflow pump would allow you to do this without breaking the floor. Gravity is your friend, and the preferred way. You do need to vent both the toilet and sink, though. You'll need to find a way to get that vent pipe up through the wall above the highest point that is a drain (normally, this is spec'ed to be 42" above the flood rim of the highest device that is draining into the pipe). You could go all the way to the attic, or even through the roof, if it works out best.