Twice Nat to a smaller subnet

Hi All,

I'm trying to create a site to site VPN between 2 ASA to a company that is requesting we NAT our local subnet to a 192.168.192.x/28. They have a lot of customers VPN into them so they provide these /28 subnets to everyone.

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My inside address range is /24, I keep getting the error that the subnets must match when trying to setup the double natting. I only have 5 addresses that need to use the VPN, how can I get this NAT statement to work? Can I create 5 different static twice NAT statements to give my inside host something in 192.168.192.x range?