Mirroring a trendline

Hi Guys,

I need a small indicator, which could mirror a trendline.
As known, a trendline is build up of a starting point (Time1, Value1) and an endpoint (Time2, Value2), which could be set in the "trendline properties"

To mirror a trendline, I manually exchange value1 with value2 in the "trendline properties"
The mirrored trendline has now the looking: starting point (Time1, Value2) and endpoint (Time2, Value1)

To save time, I need an indicator (not an EA or script),

which exchange automatically value1 with value2 by pressing a hotkey "X" , only of the last selected trendline.

This indicator should also mirror: "Trendline by Angle", "Fibonacci Retracement"

Note: Even if there are a lot of selected objects in the chart, only the last activated object will be mirrored.

All other objects remains unchanged.