Install/Restart Script in PowerShell 7

I have a script that uses the -Authentication parameter of Invoke-RestMethod and therefore requires PowerShell 7+. I'd like my script to check for PowerShell 7, install it if necessary, and restart itself in PowerShell 7 with it's current parameters to continue executing.

Here's what I have so far:

# Check for required PowerShell version (7+)
if (!($PSVersionTable.PSVersion.Major -ge 7)) {
  try {
    
    # Install PowerShell 7
    if(!(Test-Path "$env:SystemDrive\Program Files\PowerShell\7")) {
      Write-Output 'Installing PowerShell version 7...'
      Invoke-Expression "& { $(Invoke-RestMethod https://aka.ms/install-powershell.ps1) } -UseMSI -Quiet"
    }

    # Refresh PATH
    $env:Path = [System.Environment]::GetEnvironmentVariable("Path","Machine") + ";" + [System.Environment]::GetEnvironmentVariable("Path","User")
    
    # Restart script in PowerShell 7
    pwsh "`"$PSCommandPath`"" (($MyInvocation.Line -split '\.ps1[\s\''\"]\s*', 2)[-1]).Split(' ')

  } catch {
    Write-Output 'PowerShell 7 was not installed. Update PowerShell and try again.'
    throw $Error
  } finally { Exit }
}

Now, this works, but it feels really dirty.

• Is there a cleaner/safer way to accomplish what I'm wanting?
• Is there a way to get around the lack of the -Authentication parameter on Invoke-RestMethod without needing PowerShell 7 that I missed?

Thanks in advance!