Turns out the only thing that was keeping me from using alacritty was the lack of keyboard-based text selection. About a month ago they released version 0.5.0, which added the ability to toggle "vi mode," which allows built-in, simple navigation of the current buffer using common vi keys. Consider me hooked and converted from urxvt, which works well, but lacks a lot of modern features, and is a bit clunky to configure.