“The big problem is either Hamas will imbed themselves with the southbound crowd...”
For this, I think it won’t matter. They can embed in the South, but Israel will have the run of the North and can clean up that place once and for all.
THEN, they can offer the civilians safe passage back to North Gaza, while sifting out Hamas, with the definition of Hamas being any male between ages 10 and 75.
NOPE! DO NOT LET THE COME BACK! DEPOPULATE the entire Gaza Strip. Problem solved. Let Egypt ship them to Turkey on boats.