Multiple SNAT for IPSec

[Lillefjer]

Hey

I got this problem that i need to specifiy diffrent SNAT address for customers over a single IPSec tunnel.

Layout
My local network is 172.16.240.128/25 and remote network is 81.7.129.0/20
My customers got network in 192.168.0.0/16 and they to get SNAT'et to one ip from 172.16.80.240.128/25 so the remote peer and identify the customer for auditing.

The NAT/BINAT Options in pfsense, doesnt support that and i cant choose IPSEC interface in Firewall -> NAT -> Outbound.

Any ideas? :)