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Start by booting to macOS Big Sur and opening a Terminal application window. You could try entering the command given below. If the command was accepted, then SIP would be disabled on the next boot.

sudo nvram csr-active-config=%7f%00%00%00

However, the command will not be accepted. Certain misspelling of will be accepted, such as in the command given below.

sudo nvram Asr-active-config=%7f%00%00%00

Enter the above command, then proceed to the next step.

Shutdown macOS. In the Setting window for the virtual machine, select Startup Disk. Hold down the option key and select the Restart to Firmware… button, as shown below.

Select the EFI Internal Shell, as shown below.

If desired, enter the command below to get full use of the window.

mode 128 40

Set the current filesystem to the EFI volume. This should be the mapped fs0 filesystem, so you would enter the following

fs0:

Next, verify the label is EFI by entering the command below.

vol

If wrong, then try fs1:, fs2:, fs3:, ....

Enter the command below to save the Asr-active-config variable to the file csr.bin.

dmpstore Asr-active-config -s csr.bin

Note: For more information on this command enter help -b dmpstore.

Next, enter the command below to edit the csr.bin file. You will need to correct the spelling by replacing the letter A with the letter c. The can be done by typing a 63 over the 41 on the first line.

hexedit csr.bin

The corrected file will appear as shown below. When finished save the changes and exit.

Note: The value of the variable is stored in the last 4 bytes of this file.

Enter the command below to create the csr-active-config variable in NVRAM. SIP will now be disabled on the next boot of Big Sur.

dmpstore -l csr.bin

If desired, enter the command below to remove the Asr-active-config variable.

dmpstore -d Asr-active-config

Enter the command below to leave the command shell.

exit

From the Boot Manager, select Mac OS X to boot Big Sur.