Currently there is no way for retail to do that, but rest assured, a brilliant guy might create that product for you very very soon in the form of an ETF (Just like GLD and SLV for physical gold and silver).
Email Carl Icahn: https://seekingalpha.com/news/3564409-your-negative-priced-oil-belongs-to-carl-icahn-now
People who don't read the prospectus of the contracts they are trading are throwing their money away. There are some generous answers on this thread that give perspective to the current situation, beyond the dry facts provided by the prospectus. That type of reaction is what makes ET worthwhile.
This is a very good hobby for retired trader to do, ie to take delivery. One day, when I have nothing else better to do, I will do it
It should be fun. Then I will find way to sell it from homestead. Of course I must do lots of research before doing it