No, unfortunately, you can't simply write a letter to the judge. Well, technically, you CAN write a letter to the judge, however, the odds of the judge 1) reading the letter and 2) doing anything in response are extremely low.
There are several reasons for this. First, judges are extremely busy and simply do not have the time to read all the letters that come into them. Additionally, a letter to just the judge would be considered an ex parte communication and therefore inappropriate. Further, from a legal perspective, a letter does not create an ability to act.
So yes, to actually make anything happen on behalf of your husband, a motion would need to be filed. Once the motion is filed, it can be set for a hearing. While it's rather speculative, I would suggest that the entire process would take about a month or two.
Also, several customers have asked how they may direct a question to me in particular. If you specifically want me to assist you in your legal matter, just put "FOR JOSEPH" in the subject line and I will gladly pick up the question as soon as I am on-line.