Use tools like NTLite to remove unwanted components from an official ISO. This allows you to control exactly what is removed while keeping the core system safe.
Instead of a third-party "slim" build, you should download a verified version and customize it yourself: Download Nux Windows Pro X64 Slim [22000 348] iso
After installing official Windows, you can use trusted open-source scripts (e.g., Chris Titus Tech's Windows Utility ) to remove bloatware and telemetry. Use tools like NTLite to remove unwanted components