Stopping a powershell script with a key combo

I have been trying to stop a loop in powershell using multiple keys. I wanted something that wouldn't be normally or accidentally pressed, like Fn-F8, or any two key combination. I do not want to use ctrl-c, as the program will run in the background and it will have to do some "cleaning up" upon ending. The code I have below will end by pressing a single key, but that is as much as I could figure out.
Thanks in advance.

$continue = $true
while($continue)
{

if ([console]::KeyAvailable)
{
echo "Toggle with F12";
$x = [System.Console]::ReadKey()

switch ( $x.key)
{
F8 { $continue = $false }
}
}
else
{
# Prints a loop is ended
Write-Output "1"

}
}


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