Thanks for writing in with your question. Something to keep in mind is that the suggested weekly volume used in TftNA book is for the aerobic training only, not the strength training. That’s because the aerobic training will progress weekly in volume since volume or duration are the biggest stimulus to improving aerobic capacity. Whereas the strength training volume will not change much week to week.
The 24 week expeditionary plan will still be the best plan for you now and in the future. It is the one that most closely follows the books structure. It has the longest transition period and it will serve you very well manny time over. If you are going buy one plan I recommend to get one that you can use over and over again. In your case start out by following the structure of the plan but at reduced hours.