benj111uk wrote

I have been able to bridge the connections, but then I cannot access the CPE210’s settings wirelessly to select a different network.

As soon as you bridge the wireless uplink with your wireless LAN, your devices will be part of the wireless network the CPE connects to. To have the CPE's IP address assigned to one of the foreign network, use DHCP, but you will have to find out the assigned IP. To use a well-known, unchanging IP for the CPE's web UI, set a static IP for the CPE and create an IP alias to your (client) device's wireless interface, so you can use either network.

IP aliasing is a technique introduced to UNIX in the early 1990s. It was needed to host web services for different customers on one server only, which needed to serve several domain names for such customers. IP aliases provide several network addresses (kind of virtual interfaces) on the same physical NIC so a system looks like multiple systems. It's handy if you have just one physical NIC, but want to access it with several different IP addresses.

All UNIX-like systems (such as Linux, OpenBSD and MacOS) support IP aliasing. Since Windows claims to be POSIX-compatible since Win NT and therefore is - at least partially - a UNIX-flavor also (big surprise), it should support it, too. For true UNIX systems, see:

MacOS: https://discussions.apple.com/thread/481206?start=0&tstart=0
OpenBSD: https://www.openbsd.org/faq/faq6.html
Linux: http://www.tldp.org/HOWTO/pdf/IP-Alias.pdf