Check out tag-based failover. https://documentation.meraki.com/MX/Site-to-site_VPN/Tag-Based_IPsec_VPN_Failover However, have you consider putting in an MX into that site, and then plugging that into a port on the ASA (call that port something like WAN), and then pretend that the MX is a standard WAN router like you would get from a private MPLS provider? You could use the MX in VPN concentrator mode as well if you like. For the remote party, tell them its a WAN router.
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