I understand you have completed SSB, and did you also get in some swim and run? In that case I would progress to HIM build (whatever volume suits where you are at now and what your time allows) week 1-4 and consider the last week of the speciality phase for taper as week 5.
With a four week lay off, I would estimate that you’ll lose 3-4 weeks of training fitness. What that means is that you should step back in your plan and repeat the last 3-4 weeks uon return from your trip to make up for that loss in fitness
Then, be sure to do Tri Specialty Week 8 in the week leading up to your race since this is your Taper Week. This week will prepare you for your event by reducing the overall training volume while keeping the intensity and frequency high to retain your snap.