Handling different end points for AWS API Gateway Stages

I want to be able to change my end point defined in each API Gateway method so that a staging environment called "Dev" points to my internal Dev API and Prod stage of course would route to my Production API.

Right now I'd have to manually change each method and then deploy to the prod stag but now to do any testing I'd have to change them all back again for a dev stage.

I am moving ahead with a DNS switch to move Dev to Prod but future development still requires a change on every method.

Any ideas? Thanks