Add 802.11ac to previously 802.11g device

I have a number of Cheap webcams which have 802.11g wifi. The problem I have is bandwidth in the 2.4ghz band rather than signal strength. My house has 3 EAX80 Wifi Extenders in AP mode. As my 2.4ghz devices also have ethernet sockets I was wondering if there was a Netgear device such as a Wireless Ethernet Bridge which could be configured to make a fast connection to my WIFI 6 network and allow a single ethernet cable/device be plugged into it.

Now I've seen a lot of 3rd party cheap devices on the internet but they all seem to want to act as a wifi repeater at the same time. If I use these devices they I will have the problem of other devices connecting to them and loosing the benefit of my WIFI 6 network. 

So in summary "webcam" to "ethernet wifi bridge" via cable and then "bridge" to "AP" using WIFI 5ghz band - but without acting as a AP itself.

Given these cameras are cheap I simply cannot contemplate putting in more EAX80's or similarlty priced devices (however good they are).