I think that having them retain their equipment AND weapons and maybe even not getting a hp buff, but getting access to different/better commands along with the full restore at full moon light would be optimal for this race.
Maybe the Moon runestone increases damage (by a %) while you' are in wereform instead of removing your ability to morph or at the very least allows you to morph without the moon being present? Heh that would be cool.. like a higher generation were race.
The twice a month is pretty rare for were's to have to endure, but to have it be a complete n*** that it would make you want to never have to do it, just seems like a waste of a cool race, and requiring a runestone to avoid changing just seems like a slap in the face, now you get 1 less runeslot too.