welcome to the community @mvhirsch and very great to hear that you love n8n!
About your question. It sounds it would require the same as what is needed for this one:
That is sadly currently not possible. A webhook-URL is unique for every workflow and you can not simply point it to a totally different one. I can definitely see how that can be needed and it will probably be possible in the future but have sadly no estimate. That depends on how much development resources are available and how many people are requesting this feature.
In the meantime, it is probably best to handle that externally with something like Nginx or:
You can create your webhook endpoints in Kong and then dynamically change them if you need them to point to another workflow. Sorry, I can right now not think of another good temporary solution.