I actually don't understand why this isn't the best option right now. The east bank is mostly empty, and the channel is pretty shallow. You could probably construct a 1km detour within a few weeks with relatively low cost. Seems like a good way to hedge the bet of getting it unstuck.
The length of the whole canal is 200km and it took 10 years to build. I don't claim that it's exactly linear, but it sounds reasonable to assume a few weeks for just a 1km segment. The soil is soft and the canal isn't deep.
( I'm joking, do not take this as a serious solution )