Print a packing slip before a label is printed

[coalfield]

I usually prepare my shipments before sticking on the labels, and handwrite the name of the client so I know which label is for which package.  Frustratingly its not possible to print the packing slip before the label, which causes issues with my workflow as I cant seal the packages ready for the label to be affixed.  As a result I resort to printing the packing slip via ebay.

Would it be possible to allow the packing slip to be printed despite no label being printed (yet)??