The one thing you _need_ to pack, apart from visa docs required for travel, is a credit/debit card. Anything you’ve missed can be purchased on location.
Traveling to rural Vietnam looked daunting and dangerous for people from the EU, but once there me and the friend realized all the worrying and excessive preparation was for naught. We still forgot some things, an hour or two spent at the local shops and the problem was resolved. All you need is an accepted way to pay and you could get out of almost any reasonable situation.
Now would it be cost effective? Surprisingly sometimes yes, but even if not it could give you some more stories to tell. Part of the fun of traveling is the stories you tell afterwards, and no good story starts with “everything went according to plan”.