You need to find someone you trust. There’s no technology that can prevent someone disclosing data if it’s their job to work with that data.
If you treat people with respect and pay them well, you will be amazed at what they give back. Especially autistic people, they tend to have high personal integrity.
This is often why autistic people don’t climb the ranks in technical organisations, even if we are much better at our jobs. Some places create technical specialist roles that are equivalent status but there is a premium on leadership qualities rather than technical excellence.
The Egyptians built the pyramids by moving huge blocks of stone on skids. This was achieved by organising vast amounts of manpower. What they needed was some autistic people to point out that only a handful of people are required if you use some wheels.
Also Sledder ‘no low ball offers, I know what I git’