You can do the same in BSD. PC-BSD has guides on how to turn FreeBSD in to True OS and PC-BSD. You may consider doing it that way. There are a few reasons you might, in your case it seems to be the only viable option. If you're bored, that could eat up some free time (that's why I'd do something like that LOL). It could be good prep for making your own distro too (so like a distro that sits between CentOS and Foresight). All that being said though, Trisquel is really the only relatively current FSF endorsed distro out there, so I'd look into that one instead.