Note. Only runs in Dynamo 2.0.0 +

Prior to running. Delete anything in column B in the excel doc.

Run Script once in dynamo (not the player)
An Excel document will open.
The Excel Doc will populate the first column with the sheet numbers from the project.
Fill in the second column with the replacement number you want.
Save the excel file.
run the script again. 
Drawing numbers will be replaced in the model based on the number in the 2nd column.