AirLink RV50 VPN to Cisco ASA5500

I need to set up VPN tunnel from AirLink RV50 to Cisco ASA5500 VPN server.
The AirLink RV50 Mobile network LTE ip-adress is negotiated and unknown. The lan adress is RFC1918 private ip-adress and routed through the VPN tunnel to centralsite ASA5500.
The AirLink RV50 need to have individually VPN user credentials so I can handle VPN account centrally.
OpenVPN, that have individually user credentials, seems not to be supported by Cisco ASA5500.
IPsec VPN tunnel is only configurable with preshared key.
Is there any other way to solve my problem?

Hi msuu,

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