Would there be any benefit to keep taking Indigo-3G while on vacation and not being able to workout?
For sure. You’ll still get from the nutrient partitioning/carb shuttling benefits, presuming you’ll be eating food while you’re on vacation. In fact, the benefits discussed here don’t necessarily rely on training for maximum effectiveness, it’s just that when your’e training, the body is extra-sensitive to the effects so you get a double-whammy.
Like the label directions say, take it before workouts on training days or before dinner on non-training days. You’ll just happen to have a bunch of non-training days in a row.