Interesting, but why would the brands need you? If they're offering a few days/week free trial period, they can do this directly?
Also, it's a bit of a complicated model (logistically). What is more common, is that some companies lease out products: you pay per day/week/month, and then, if you want to keep the product, you pay the difference. If you don't want to keep it, you give it back (and you only paid for the time you used it).
Good luck
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