I don't know how you'd address the question of trust - i.e. me not running off with your card, but I'm open to any ideas for solving to that.
No doubt you know an RTX 4090/4080 costs > $2,500 and I just don't have the money to be buying cards to test on, so hoping to find someone kind enough to help out.
Email address is here: https://news.ycombinator.com/user?id=andrewstuart