Turning an excel cell into a check box - but selected cell range only not the whole sheet

[MilsonHQ]

I really like the answer to the first part of my title found in this thread Turning an excel cell into a check box

The code they gave to do that task is as follows:

Private Sub Worksheet_BeforeDoubleClick(ByVal Target As Range, Cancel As Boolean)
Cancel = True
    With Target
        .Value = "Ö"
        .Font.Name = "Symbol"
        .Font.FontStyle = "Regular"
        .Font.Size = 12
        .HorizontalAlignment = xlCenter
        .VerticalAlignment = xlBottom
    End With
    
End Sub

But can anyone tell me, how would I modify the above code to target only specific cells that are double clicked and not the entire sheet? For example just a range say A:1 through C:20 or multiple ranges on the sheet A:1 through C:20 and A:26 through C:46 or similar.

Also

How about the ability to remove the check mark if the cell is double clicked again?