2.4GHz Wifi

I am using a NUC to host the Home Assistant (HAOS). This is connected via an ethernet cable to our Vodafone Ultra Hub. However, this hub does not allow for the splitting of WiFi bands and some of my smart home stuff does not connect to 5ghz. I would like a solution to be able to connect these products in a way that home assistant can still see these on the local network. I was thinking about an access point but I'm not sure if this would should as a separate network? Any suggestions?