Guild Lockout Notice

A player's guild disbanded. He joined a random guild. He was then recruited by our alliance, trying to help find homes for the disbanded guild. But when he left the random guild and tried to join ours, it wouldn't let him because it said he has joined too many guilds in a short period of time. I understand the need for this due to combat players from guild-hopping, but now the player is locked out of joining a guild before geo TB, which is not fair to him.

I feel this scenario could have been prevented by some sort of Guild Lockout Notice that pops up to warn you that if you leave your current guild, you will not be able to join a guild for 24 hours.