Accidental double exposure questions

Hi guys!!

I was an idiot and in a tired haze opened the back of my Olympus mju instead of opening the battery compartment to switch the battery🤦‍♀️ the film completely rewound back to the 1st frame. I had 20 shots on the roll, so I don’t want to miss out on the last 16.. however, I’m also not super keen on double exposing the first 20. No doubt this will become a wacky roll, with the back being opened and some double exposures. But wondering what your advice is.. should I just photograph the sky and get some funny cloud double exposures over the first 20 photos, or should I just wind the film back (not sure how) and take the loss of the 16 remaining unshot frames…

I’m leaning towards double exposing, and wondering what a good subject would be that won’t overtake the photos I already shot.

Appreciate any advice :-)