No one has offered a viable solution to what the OP experienced. Delta 141 ended up cancelling and booking another FF ticket, but most of us would be left potentially stranded. Paying $1500 and claiming back from AA-never gonna happen. Shipping bags separately-not enough time. Sorting ticket out with AA agents-I am highly doubtful any of us would get an experienced agent that could re-ticket, especially when time was running out.
In fact who has actually had their QR ticket, re-ticketed by AA to sort this mess out? Are there any data points as none of the agents I spoke to would offer me that option. The only other thing that I would have done is perhaps called Qatar customer service or even the ticket office in Bangkok.