Unless you're peaking for something in March, I don't think you need to be too worried about a lack of volume at 400m pace or better...
I have used Daniels ideas for my team for ~10 years. I live in one of the snowiest areas in the U.S. and use the 24 week build up for track. Most of my guys ran XC in the fall and continued to run afterwards with no particular structure to their training for 6-7 weeks.
The next 6 weeks will contain a partial hill workout (5 x 300m 7% grade @800m effort or ~1500m speed) at the end of a typical run, a day with significant volume at marathon pace, a long run, and 3 other days with mileage as necessary to reach their weekly goals including 1% downhill strides on the road at 800m goal pace. Each week we add one hill and reduce the pre-mileage so that we have a complete hill workout by the end of the phase. At this point I don't worry to much about recovery times on the hills. I want them running with good form and developing the power they'll need in subsequent phases. We alternate between 5 mi @MP and 10 x 1 mi @MP w/1:00 recoveries for the 2nd hard workout each week. We also have 2-3 workouts each week that significantly stress the core (chest to knees - try the P90X DVD's for one of these each week) and use speed ropes with the intent to reduce ground contact times. Those that will have a high emphasis on the 800 in the late spring have also started lifting; though, we limit that to the Olympic lifts for the most part.
The next phase we'll maintain hill workouts every other week and add in some repetition work with flexible rest intervals on the other days. The repetition work is done on the roads in a nearby neighborhood as we won't be able to see our track until mid-March. The MP work is replaced by tempo effort runs - continous one week/cruise intervals the next. The long run becomes a progressive run at this point as well. Core work continues 2-3 days/week; though, I expect the guys are doing some core work at home every night and have been doing so all along.
The 3rd phase begins the first week we have meets. The make-up of the team, the abilities of each runner, the weather, and the level of competition expected in the dual meet and the invitational each week all influence what workouts look like for the week for each runner. Things become very individualized at this point.
JV types don't run in invitationals so I tend to have them to tempo type work on Monday, the dual meet on Wed. counts as their rep workout, and they do an interval workout on Fri or Sat depending on the date/time of the invitational. Get every kid into the 4x400 at the end of the meet if you can. At first many will not like it, but it becomes a shared team experience and teaches them how to run hard when they are tired. The rest periods during the interval workouts become much shorter as the phase progresses - these are some of the most painful workouts of the year.
We try to place varsity guys in their primary events at the invitationals on Fri/Sat and use the dual meets to create a tempo effort type day. They might do 2 mi at T-pace shortly after getting off the bus and then again during the 3200m run. Most will do a field event and all will do the 4x400m. Our dual meets do not affect our league championship so we have quite a bit of flexibility. There are some teams that you want to beat heads-up in a 4x800 and so the dual meet isn't always a pure tempo day, but it doesn't approach the intensity of an true interval/rep day. Monday becomes their interval day. If the invitational is on Saturday, Thursday becomes the long run. If the invitational is on Friday, the varsity guys do the long run Saturday morning while the JV guys are doing their track workout.
The final phase for the varsity guys begins the week before our league championship. This gives them 5 weeks before the state meet. Between the 6 weeks in the prior phase and the faster running during this phase, your runners have plenty of time to optimize their anaerobic system and their efficiency at race pace and faster. You really don't need to worry about 400m pace stuff in the early phases. If you are using a 24 week plan, there is plenty of time for that later.