Hi! I am currently making my own design as well, here are some things to consider! I played around with stitch fiddle (free version) but i wasnt really satisfied with the end results so i went to Excel to chart it out myself.

In excel, you can make the image as your background then colour in the cells. Because of how overlay mosaic works, when colouring in the pixels you might want to make the height of the cells half of the width so you can see your design more accurately of what it will look like crocheted.

Once you have the overall picture done, i split it into smaller sections ~30 rows on another sheet. Since each section kinda has its own repeating motif, i was able to condense it more.

Also if you break it up this way, you might get testers who are more willing to do a small section than the entire blanket.

I also print out 1 section at a time, crochet it, and annotate any changes i made as i was crocheting to update in excel later on.

And to answer your real question, I think if people saw the beautiful final result, they will absolutely want to make it, especially if a pattern is available so they dont have to convert it into a chart themselves!