Keeping a chroot environment inside your installation suffices most of the time. If you do end up bloating your chroot, you simply make it again... no harm to your existing running installation.
Could you explain how to do this? I have no idea how to create a chroot environment. I have done that as an experiment, but I couldn't see how it would be "clean" after I had added things needed by a package I would create. When I ran chroot, it was simply mounting my VL6 Light partition. Whatever dependencies I added would be on the actual partition. This can't be what you mean.
I'm sure I'm not the only one who doesn't understand how chroot would keep my packaging partition clean.