I suspect that all of the recent sales have a get-out caveat if the 10 is not certificated, or within reasonable timescale / cost.
Reading between the lines of F’boro reports, the third AoA source has been provided, probably by electronic means by integrating other sensors, leaving the EICAS to be negotiated separately.
This might just tip the balance with other certification authorities, particularly if the FAA were to threaten hard ball with future bilateral agreements, then Europe / Brazil might be more be more amenable to accept the 10. But China, etc?
Any compromise would not be in the best interests of aviation safety, nor FAAs image, but then safety is dominated by money and national interests.