SupportsShouldProcess Template.ps1

<#
    IsReady is the option of an internal determination of whether an operation needs to execute or is safe to execute.
    A switch of -WhatIf will override anything else.
    A switch of -Force can override an unsafe operation. It is not prompted.
    A prompt for confirmation only occurs if needed, and this will show on interactive sessions, while being denied on
    noninteractive sessions.
#>

function Test-ShouldProcess {
    [CmdletBinding(SupportsShouldProcess)]
    param (
        # IsReady would be set your code and is only specified here for testing purposes
        [switch] $IsReady,
        [switch] $Force
    )

    <# 
        ... 
        Phase that determines if a change is necessary and safe
        ...
    #>

    # Confirmation phase
    if (
        # Simulate if WhatIf was used
        $WhatIfPreference -or
        (
            # Simulate if we're not ready and $Force wasn't specified
            -not ($isReady -or $Force) -or

            # Simulate if settings do not require confirmation from the user
            -not ($ConfirmPreference -eq "None" -or $ConfirmPreference -ge "Medium" -or (
                    # Simulate if we are able to receive confirmation from the user
                    $Host.UI.SupportsVirtualTerminal -and $PSCmdlet.ShouldProcess("Target", "Operation")
                )
            )
        )
    ) {
        # I prefer to use a Warning here because simulation messages get easily lost in Verbose printing
        Write-Warning "Simulate"
    } else {
        Write-Verbose "Execute" -Verbose
    }
}

Test-ShouldProcess                          # It's not ready, simulate
Test-ShouldProcess -IsReady                 # It's ready, execute
Test-ShouldProcess -Force                   # It's not ready, force execute
Test-ShouldProcess -WhatIf                  # It's irrelevant if it's ready, simulate
Test-ShouldProcess -IsReady -Confirm        # It's ready, check with the user whether to execute or simulate
Test-ShouldProcess -IsReady -Confirm:$false # It's ready, execute

<#
Notes:
    IsReady is the option of an internal determination of whether an operation needs to execute or is safe to execute.
    A switch of -WhatIf will override anything else.
    A switch of -Force can override an unsafe operation. It is not prompted.
    A prompt for confirmation only occurs if needed, and this will show on interactive sessions, while being denied on
    noninteractive sessions.
#>

function Test-ShouldContinue {
    [CmdletBinding(SupportsShouldProcess)]
    param (
        # IsReady would be set your code and is only specified here for testing purposes
        [switch] $IsReady,
        [switch] $Force
    )

    <# 
        ... 
        Phase that determines if a change is necessary and safe
        ...
    #>

    # Confirmation phase
    if (
        # Simulate if WhatIf was used
        $WhatIfPreference -or
        (
            # Simulate if we're not ready and $Force wasn't specified
            -not ($isReady -or $Force) -or

            # Simulate if settings do not require confirmation from the user
            -not ($ConfirmPreference -eq "None" -or $ConfirmPreference -ge "Medium" -or (
                    # Simulate if we are able to receive confirmation from the user
                    $Host.UI.SupportsVirtualTerminal -and $PSCmdlet.ShouldContinue("Target", "Operation")
                )
            )
        )
    ) {
        # I prefer to use a Warning here because simulation messages get easily lost in Verbose printing
        Write-Warning "Simulate"
    } else {
        Write-Verbose "Execute" -Verbose
    }
}

Test-ShouldContinue                          # It's not ready, simulate
Test-ShouldContinue -IsReady                 # It's ready, execute
Test-ShouldContinue -Force                   # It's not ready, force execute
Test-ShouldContinue -WhatIf                  # It's irrelevant if it's ready, simulate
Test-ShouldContinue -IsReady -Confirm        # It's ready, check with the user whether to execute or simulate
Test-ShouldContinue -IsReady -Confirm:$false # It's ready, execute