Activate "Sign document by typing or drawing a signature" With Button

I've created a PDF form in InDesign using the Digital Signature form field, but that field's requirement to create and configure a Digital ID will likely be confusing and onerous to users, and that level of security is unnecessary in this case.

I would prefer a behavior like Acrobat Reader's "Sign document by typing or drawing a signature" > "Sign" > "Add Signature" where the user can just generate and place their typed or drawn signature in the proper spot.

I've read elsewhere that functionality may be achieveable by replacing the Digital Signature field with a button that uses JavaScript to activate that tool, but I don't know the right syntax to activate that tool. After a ton of searching around, I've tried:

app.execMenuItem("OpenApp_FillSignApp")

... on a button's Mouse Up event, but that doesn't want to work. As may be obvious, I don't know JS nor how to attempt debugging.

Ideally, I'm hoping clicking/tapping that field would be able to go straight to the Type/Draw/Image "Type your name here" modal overlay (see attached screenshot). Is there a JavaScript action that can do this, or otherwise remove the requirement for a Digital ID? Would this cause compatability issues on other devices mobile devices?

Thanks for your time.