I know - I am pretty lazy. So I didn't follow through with my plan to get flip flops and do the shoes that way they looked in the picture.
Instead, I trimmed down the shoe to actual foot size and sewed three straps on - created an ankle strap. Checked all the sizes as I sewed to make sure it would be tight enough (it actually needs trimmed a tiny bit on the right side still) and ended up with this!
They are comfy, lightweight and should help me on the days I don't wanna wear shoes at all! What do you think? Good/bad/keep working?