Automatically Format Range Based On Formula Result Of Cells

The following code works perfect but the "change" event is only triggered when working directly on intersect range. Tried using the "calculation" event but could not figure it out. This is what I want:

1) To replace the code provided below using the calculation event
2) To only trigger the event for the row(s) where the new value was generated, not for the whole "For Each" statement
3) To use one single code for all worksheets, instead of copying the code in every working worksheet on the workbook, if feasible
4) And I would like a "second alternative", where the user of the workbook can click on a button and trigger the event on every row on the workbook that has a non empty cell within the intersect range, assuming that the intersect range column is the same for all worksheets

Private Sub Worksheet_Change(ByVal Target As Range)
Dim c As Range, d As Range, fc As Long, bc As Long, bf As Boolean
Set d = Intersect(Range("I:I"), Target)
If d Is Nothing Then Exit Sub
For Each c In d
Select Case UCase(c)
Case "C"
fc = 1: fb = True: bc = 4
Case "O"
fc = 2: fb = True: bc = 3
Case "D"
fc = 2: fb = True: bc = 46
Case "G"
fc = 2: fb = True: bc = 5..................