That’s a contradiction in terms. “Gerrymander” is a deliberate act to form a convoluted district only to preserve a seat – one that follows no natural boundaries. If the Republicans are worried that districts in cities lean the other way, then it’s up to them to form policies that might appeal to at least some of the people in those districts. They might, to take an example at random, dump the appeals to racism.
ETA the word “in” above.