For suggestion 1, I should clarify that you already are using Microdata. Your Microdata is repeating what is already in the page, rather than "tagging" your existing content inline. Microdata is a good tool to use if you are able to tag pieces of content as you are communicating it to a human reader; it should follow the natural flow of what you are writing to be read by humans. This guide walks you through how Microdata can be implemented inline with your content, and it's worth reading through to see what's available and how to step forward with manual implementation of Schema.org with confidence.
Will these solutions remove the duplicate H1 tag?
Whatever CMS or system you are using to produce the hidden microdata markup needs to be changed to remove its attempt entirely. The markup of the content itself is good, but it needs to be combined in with existing content or implemented with JSON+LD so that it is not duplicating the HTML you are showing the user.
Are these options relatively simple for an experienced developer? Is one option superior to the other?
Both should be, but it depends on your strategy. Are you hand-rolling your schema.org markup? Is somebody going into your content and wrapping the appropriate content with the correct microdata? This can be a pain in the butt and time-consuming, especially if they're not tightly embedded with your content production team.
I downloaded the HTML and reviewed the Microdata implementation. I don't mean to sound unkind but it looks like computer-generated HTML and it's pretty difficult to read and manipulate without matching tags properly.
Is one option superior to the other?
Google can read either without issue; they recommend JSON+LD (source).
In your case, I'd also recommend JSON+LD because:
- Your investment in Microdata is not very heavy and appears easy enough to unwind
- The content you want to show users isn't exactly inline with the content you want read by crawlers anyway (for example, your address isn't on the page and visible to readers)
- It's simple enough to write by hand, and there exist myriad options to embed programmatically-generated schema.org content in JSON+LD format
Please review this snippet comparing a Microdata solution and a JSON+LD solution side by side.
PLEASE DO NOT COPY AND PASTE THIS INTO YOUR SITE. It is meant for educational and demonstrative purposes only.
There are comments inline that should explain what's going on: https://gist.github.com/TheDahv/dc38b0c310db7f27571c73110340e4ef