Not really. Already hosted packages like Boost, Zlib, OpenSSL, ZMQ, Protobuf are packaged and hosted without changing a single line of their respective build, a

Not really. Already hosted packages like Boost, Zlib, OpenSSL, ZMQ, Protobuf are packaged and hosted without changing a single line of their respective build, and with just a single conanfile.py to define the packaging. The build systems of those libraries are heterogenous: Cmake, B2, perl+nmake... The build system is just wrapped by the conanfile.py. Those conanfiles can be also in a separate repository and retrieve sources from any origin as github, so not intrusive at all.