How to over-ride slide number in Impress

I have slide numbers selected and ‘do not show on first slide’ but I would like the second slide to display as 1), third as 2), etc. How can I do that?

IMHO there is no solution to this.
You can suppress the display of the first page number. But for slide 2, 2 is then displayed.

Is it possible to add an operator to the field, e.g. <number -1> or to create a new custom field?