Is the Huawei B315s-607 still the only router to work with RBI?

Hi All.

After a brief trial of RBI and getting 40Mbps up and down, we have signed up and are only now confronting the limitations of the Huawei B315s-607 CPE. (LAN side IP address must be within the 192.168. range, no way to add a static route).

Vodafone markets this service to business and residential customers but the CPE works in only the simplest single-subnet environments.

Is there still nothing better available to get around these limitations?

Or is NAT required (using another box), to make our 172.16.32.0 /22 network (120+ PCs) work with RBI?

Could the RBI SIM be swapped to a SIM without the TAC lock?

How might a VPN help?

All ideas will be welcome.

Scott