Setting up a training for external contractors?

Hello!

I'm trying to find a way to let learners complete a rather long training in a few sessions, even though that training won't be in a LMS: I've been asked to set up a health and safety training for external contractors. Since they don't belong to our organization, they don't have access to our LMS. Since there's no other need for a training designed for people outside the organization, there's no plan to adapt the LMS for such a situation. 

I have something that almost works but I see no workaround for the last issue:

• The training has 15 lessons, divided into 3 sections.
• Each section ends with a quiz. I was asked to require 100% success, and progress to the next section is blocked until the learner succeeds.
• After the 3rd quiz, there's a special section to congratulate the learner, with a button/link to a MS Forms, where I ask the learner's identity so that they can receive the necessary documents to start working on our premises.
• Since it doesn't need to be linked to other trainings whatsoever, and we don't even need to track the reuslts of each quiz, this is a solution that could be exported to a Sharepoint/our website. 
• However, these 15 lessons in a single seating is a bit steep. I'd love to let the learners do 1 section and resume the next day. That's where I'm stuck, as it seems that this feature would require the course to be integrated to a LMS.

Does anybody have a suggestion, please?