They are, for the most part, available as source code, so even if they aren't in the arch package set, they are available to be downloaded and compiled. I have compiled ratpoison on slackware with minimal issue a ./configure && make && make install worked just fine last time I built it from source, your mileage may vary but it should be easy, or at worst a slight annoyance to get it installed and running.
Before you start using one, it will be in your best interest to look up the tiling WM you plan to use and learn what key commands you need to know to make it function, because for the most part your mouse will be decorative.
Worth looking at: https://wiki.archlinux.org/index.php...indow_Managers
to help you decide