No, there's no way to re-number the measures.

If you want it as you describe, you enter your two pickup notes during the count-in. In that case, they are always played "NC", with no accompaniment, and they will be in measure 0 -- which is the pickup or "lead-in" measure.

If you do it that way, you have to delete the extra measure you just added. The measures remaining will then be numbered as you seem to want them.

It's really up to you, but normal-looking measure numbering is available no other way.

Larry
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