Using scribble signature in locally stored form

Hi everybody, hope you can help me,

 I have been playing with AEM designer, with some success making fillable expandable XML forms. I would like to include scribble signatures on the bottom of some of the new forms to capture client signatures in the field. When I tried implement this using reader on in Windows tablet the form works as expected, but the signature field brings up an image browser instead of the scribble box.

From some of the research I have I have performed online I can see the scribble signatures seem to be only for use with mobile forms, however I am often in locations where there is little to no cell signal. Can I create a form in designer which can then be opened locally on the tablet and capture signature data and save it locally with the form field data. It would then be sent to the relevant parties and stored on the network drive when I am back in a signal area?

Thanks for your valuable time

Paul