PsReadlineKeyHandler to put parenthesis around the entire line and move the cursor to the end of line.

ParenthesizeLine.ps1

$ScriptBlock = {

    param($Key, $Arg)
    $Line = $null
    $Cursor = $null
    [Microsoft.PowerShell.PSConsoleReadLine]::GetBufferState([ref]$Line, [ref]$Cursor)
    [Microsoft.PowerShell.PSConsoleReadLine]::Replace(0, $Line.Length, '(' + $Line + ')')
    [Microsoft.PowerShell.PSConsoleReadLine]::EndOfLine()

}

$Splat = @{

    BriefDescription = 'ParenthesizeLine'
    LongDescription  = 'Put parenthesis around the entire line and move the cursor to the end of line.'
    ScriptBlock      = $ScriptBlock

}

Set-PSReadlineKeyHandler -Key 'Ctrl+p' @Splat