I completely agree that everyone has a right to normalcy.
However, “The Sentinelese” and “Sentinelese Culture” are not moral patients, in my opinion. The individuals are. Each person has the right to choose for themselves how they would live, given adequate information.
I believe that holds true under current capabilities also, but there’s no way to give each Sentinelese person a choice like that without immediate disruption that is likely to make their lives worse.
If future technological capabilities allow wider society to give each Sentinelese person an informed choice of how they should live without likely bad effects, that is what I consider the best path.
4-AcO-DMT and most other psychedelics also last on the order of 8 hours (or more), while inhaled / injected DMT lasts ~20 minutes.
Normally, ingested DMT has no pharmacological activity because monoamine oxidase (MAO) in the body will break it down before it has any effect. The likely reason is that DMT is endogenous.
Ayahuasca is an ingested DMT extract that also contains a natural MAO-inhibitor. (“Pharmahuasca” is an analogue of it that uses ingestion of purified DMT plus an MAO-inhibitor in pill form).
A sub-impairment dose of DMT sounds like the least invasive treatment for this in particular.