No need to sink the ships-—breaching the Aswan would return Egypt to pre-Noah, before-the-first-flood days. And those Egyptian dunderheads ought to realize how tenuous and vulnerable they really are and be a little polite/humble/responsive all around. A major part of the Aswan is dirt/rock fill and is extremely vulnerable to bunkerbuster types of shocks. Hitting that dam would get Nefertiti’s genes pretty much out of the human pool.
My thought was that blocking the canal would cut off a major source of revenue for Egypt.