Оперировать с цифровой частью клавиатуры всегда как будто NumLock занят

procedure TForm1.AppOnMessage(var Msg: TMsg; var Handled: Boolean);
var
  ccode: Word;
begin
  case Msg.Message of
    WM_KEYDOWN, WM_KEYUP:
      begin
        if (GetKeyState(VK_NUMLOCK) >= 0)  {NumLock not active} and
          ((Msg.lParam and $1000000) = 0)  {not a gray key} then
        begin
          ccode := 0;
          case Msg.wParam of
            VK_HOME: ccode   := VK_NUMPAD7;
            VK_UP: ccode     := VK_NUMPAD8;
            VK_PRIOR: ccode  := VK_NUMPAD9;
            VK_LEFT: ccode   := VK_NUMPAD4;
            VK_CLEAR: ccode  := VK_NUMPAD5;
            VK_RIGHT: ccode  := VK_NUMPAD6;
            VK_END: ccode    := VK_NUMPAD1;
            VK_DOWN: ccode   := VK_NUMPAD2;
            VK_NEXT: ccode   := VK_NUMPAD3;
            VK_INSERT: ccode := VK_NUMPAD0;
            VK_DELETE: ccode := VK_DECIMAL;
          end; {Case}
          if ccode <> 0 then
            Msg.wParam := ccode;
        end; {If}
      end; {Case Msg.Message}
  end; {Case}
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Application.OnMessage := AppOnMessage;
end;