The present-day Linux kernel tree (not the Debian guys) actually has a target to build a Debian kernel package (make bindeb-pkg) straight out of git if you want, so you can pretty readily get a packaged kernel out of the Linux kernel git repo, as long as you can come up with a viable build config for it (probably starting from a recent Debian kernel’s config). I have run off Debian-packaged kernels built that way before, if you want to play on the really bleeding edge.