How to have DataTable indices like columns

I want to have a table with indices that act and look like columns. At the moments the only way I can think to do it is to put the right most column in the same style as the column names. However because I want both of these to be editable the editable part of it is still differently styled.

The column names have a little pencil, however the “indices” still behave like normal cells.

Is it possible to have the indices similar to the column names or is it possible to style the edit features in the same way as the rows are?

Many Thanks