Sorry i never got back to you on this, but i have just posted a simple solution to this problem here that you might be interested in.
An easy and multi-purpose solution is found to add pen-input to Sharepoint/Email/PDF by utilizing the addition of a PowerApps Json functionality added on 02/05/2019.
The Short description on how to make this work is to save the pen input image in a JSON format asking the JSON function to include Binary Data:
Set( PenVar, JSON( PenInput1.Image,JSONFormat.IncludeBinaryData ) );
See here for details: https://iiu.dk/2019/10/12/powerapps-pen-input/
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