No.

Artists are skilled and deserve respect. We do not get "possible rewards for free work". Our time is valuable and deserves payment like any other job where a skilled person provides something to you that you want.

Art is incredibly valuable for an author in your position, and you are confused about the position you’re in. You benefit far, far more from the art than any artist would benefit by sacrificing their free time for a story that is completely foreign to them right now. (If you had fans right now, who loved your book and sent you fan art to show their enthusiasm, you would be in a very different position. I suspect you don’t.)

This is no different than if someone said, "Come landscape my yard. If I like it, I might give you a reward." Nope, that’s work that deserves to be paid outright. Since many of us can’t afford that, we often barter work so that everyone involved is respected. I suggest you revise your perspective so that you don’t insult the people you’re asking for help.

Agreed. I live overseas and have fanagled some public readings at local "foreigner" events over the next month, which is something that almost always ends in sales (personal pleas for support are always the strongest),  but given the CC restriction, I feel like I’m being shot in the foot. Yes, people in Taiwanese have credit cards, but my local audience are English-speakers, the vast majority of which will not be Taiwanese. Even though there are non-descrimination laws on the books, expats generally have issues getting credit cards from local banks and, more often than not, go without.