How to use two different navigation stack packages?

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Hey guys, I'm pretty new to ros and i need to implement a new navigation stack for one robot. I have three robots running in a simulation and for one robot i need a customized navigation stack, but for the other two robots i need the normal navigation stack. I tried to get the navigation stack from github and rename it, but i recognized that i have to change every namespace (packages, cmake and even node names in the source code). This is really frustrating.

Does anyone know a better, cleaner way to do so? Or even has a fully renamed navigation stack package? :)