What if The Guardian Legend was made by Sunsoft? It would sound something like this:
The youtube video sounds a bit like lower quality mp3. So here is link to soundcloud, in case you are interested: https://soundcloud.com/paul-haas-752206774/area-34-8-the-guardian-legend-famitracker-2a03-sunsoft-style-cover
A little bit more music found today. This one is not so good but it’s OK. It’s rather like medley with various songs from the game: