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You can certainly use PowerShell to download a script from a remote location, update it with local variables, and then execute it. Here's an example of how you can do it:

# Declare your variables
$localToken = "blahblahblah1234"
$hostname = $(hostname)
 
# Download the script
Invoke-WebRequest -Uri https://mydomain.com/files/script.ps1 -OutFile C:\temp\script.ps1
 
# Update the script with your variables
(Get-Content -Path C:\temp\script.ps1) -replace 'LOCAL_TOKEN_PLACEHOLDER', $localToken -replace 'HOSTNAME_PLACEHOLDER', $hostname | Set-Content -Path C:\temp\script.ps1
 
# Execute the updated script
Invoke-Expression -Command C:\temp\script.ps1

In this script:

1. Get-Content is a cmdlet that gets the content of the item at the location specified by the path, such as the text in a file. It reads the content one line at a time, returning an array of objects each of which represents a line of content.
2. -replace is used to replace the placeholders in the script with your local variables.
3. Set-Content is a cmdlet that writes or replaces the content in an item with new content.

Please replace LOCAL_TOKEN_PLACEHOLDER and HOSTNAME_PLACEHOLDER with the actual placeholders in your script.

LOCAL_TOKEN_PLACEHOLDER and HOSTNAME_PLACEHOLDER would be placeholders in your script.ps1 file that you intend to replace with actual values.

Here's a short example of what your script.ps1 might look like before and after replacement:

Before Replacement:

# script.ps1
$myToken = "LOCAL_TOKEN_PLACEHOLDER"
$myHostname = "HOSTNAME_PLACEHOLDER"
 
# Rest of your script...

After Replacement:

# script.ps1
$myToken = "blahblahblah1234"
$myHostname = "my-computer-name"
 
# Rest of your script...