Areca nut, Coconut dont need daily maintenance.
Intercroping of Coconut,areca nut +Poms is bad combination. Pomogranates are very sensitive for fungii. Nobody tries intercroping with Poms.
Coconut,musumbi or sapota and pepper is a good combination. On the periphery you can plan silver oak, neem, Glirycedia.
Coconut, Banana and Pineapple is one more combination.
Papaya, mango and Season vegitables ridgegaurd,bitterguard is also good option.
As agreen manure you can plan velvetbeans, cowpeas or any dicots of your choice.
My suggestion is, go for Papaya or Banana for half of your farm, This gives you immediate returns for you to sustain.
Because most of the plants yeilds after 3-5 years. Until then you need some returns.
Animal farming is another option for quick money.