Creating binaries that aren't directly useable in third-party projects probably doesn't benefit the community very much.
Why wouldn't the created binaries be usable in third-party projects? As long as the online services generate all five flavors and make those binaries available for download somewhere (ideally, the project website?) shouldn't that benefit pretty much everyone?
You mention Maven - I'd be very much in favor of making the same downloads also available as Maven artifacts (note that this does not require the binaries themselves to be different - Maven adds some XML metadata files), primarily because that's what I need for my personal project, but, more importantly, the Maven repository structure is used by other dependency providers that are commonly used in Java projects.
My initial thought was to separate concerns, and first focus on creating the binaries themselves, and possibly make them available again as simple downloads. Later, I was planning on working on making those binaries available via dependency management tooling (like Maven). We can take them on at the some time though, if you prefer.