I'm looking to book a one-way award in J on CX using Asia Miles for two people HKG-EWR/JFK Jan 2, 3, 4, or 5. There's no current availability at the standard level. We have no status. Ideally we'd book with AS miles, but that seems unlikely so we'd probably transfer MR from Amex to AM once there's availability. I must get my spouse back on one of those dates. I'm a bit more flexible. We'll travel in Y if we have to (or F!), but would prefer J. We can book as late as a day before departure if necessary. Thanks in advance!

1. Is there a limit to the number of waitlists I can do?
2. What are the advantages/disadvantages of waitlisting an award for two vs. waitlisting an award for me and separately waitlisting an award for her?
3. If waitlisting an award for me and her separately, is there any advantage to waitlisting each of us from our respective AM accounts vs. from one of our AM accounts?
4. What would you do?

[edit] Almost forgot: there are at least two Business Choice awards available for two of the flights. Obviously I'd prefer to pay the Standard rate.