Thank you for writing to us.
I am sorry but there is no way to restore deleted people and their id numbers in the tree.
We apologize for the inconvenience.
Esther / MyHeritage Team
I'd like to have such a feature, too.
I have imported an old GEDCOM file, changed the "Home Person" (to me...) but exporting data the "Home Person" (#1 record) of the old GEDCOM file still is #1.