I am one of those affected and for this time the three solutions seem good to me. But for future sales, the only thing I see as necessary would be a tutorial on how the sale would work so that people could be ready un the real sale. For the rest, the first come first serve system seems to me to be the right one since by notifying interested people with time, it can be organized. Of course, the use of bots tonbuy is forbided.
Sorry for my level of English.