Ask HN: ToS+Signature+Mail Solution

My friend owns and operates a small local machine (diggers, lifts, other heavy machinery) rental service with one employee and his dad helping out. Whenever a customer gets delivery of a new machine, they need to be taught how to use it properly, and they need to sign off that they've received the training and that they're satisfied. My friend has been doing this with pen and paper, but now he's almost ran out of the initial print run of these forms, and asked me for a tech alternative.

I said sure, there's plenty of ways of signing documents easily on a phone or tablet. Keep a PDF with a signature field, open that, have the customer sign it using a finger or stylus, save the PDF with a new name and mail it to yourself.

The problem is, this is just too many steps, especially for his dad who is almost 70 and can barely operate the SMS function on his phone.

What they need is an app that they can add on their home screen that: 1. Opens up and immediately shows the ToS/EULA-text 2. Has a signature field / drawing canvas below where the user can draw their signature 3. A text input below that where they enter their initials 4. A button that says "I understand what I'm signing"

(Someone would perhaps say this is not sufficient, but it is in our country, mostly because you're physically there with them when they sign.)

Clicking the button would create a PDF with the text+signature and automatically email it to a preconfigured/hardcoded address (and save it locally with a random name), and the app would be replaced by a large, friendly text that said "OK" in green. Even if the email failed. Clicking anywhere would then kill/close the app.

Anyone know of something that would be close to as simple as this? Or know someone we could pay to make it?