I've never been in any alpha, but I'd like to help. Just I don't know how much effort it will take. Is there a minimum amount of time you expect us to devote to the alpha? Because at the moment I can play 1 or 2 hours/day (a bit more during weekends) but I'm not sure if it is enough for you.
I reported several bugs on mantis, so you can have an idea about my skill in that, if you need.
I also reported bugs for games like widelands, ottd, freeciv, etc... so I think I've quite an experience in that.
if it is enough, feel free to put me in any group at any stage, according to your needs.