Retaining display names as item names when change a numbered list to unnumbered?

Peter40

A list which has been used to dimension many input line items was incorrectly made a numbered list when it should have been a normal unnumbered list. I can change it to unnumbered but am left with the expected #123 number as the item name. What I now want to do is replace the #123 with the display name but so far I have found no way of doing this. I can delete the existing items and insert the new items easily enough but that will loose all the data in the model which i do not want to do. I can manually change the name of each item but that will take many hours as the list is 3000 items long. Does anyone have a solution to this please?