Here are three legitimate emulators for Android. None require admin rights or registry writes.
If you encounter a file online claiming to be a "BlueStacks Portable" or "BlueStacks No Install" version, ⚠️ The Reality of Third-Party "Portable" Versions Bluestacks Portable No Install
For further experiments, the closest open-source attempt is anbox or Waydroid inside portable VirtualBox, but performance will not match BlueStacks. Here are three legitimate emulators for Android
Attempts to force a portable version of BlueStacks involve patching executables, bypassing driver checks, or using "fake" registry entries. These actions carry severe risks: bypassing driver checks