Customer has 2x VS-S2T-10G in chassis and one has failed. Is it possible to temporarily use another type of Supervisor to provide resilience?

HiI have a query which is frankly stumping me at the moment.A customer has a couple of web servers on their internal network. They need to provide access from external hosts to these servers on port 443. They have an ASA5510 which has static NAT to t...