Reconnecting my old wired network to new Sky Hub

[S_Alexander]

I have just switched to Sky from another supplier, where I previously had a wired network connected to the hub under the stairs.
With my new install yesterday, it was not possible to get the Sky Hub in the same location, so, I've lost all my wired connections.
I've been looking at my options, and if I've read up correctly, I believe I can add another wireless router - perhaps an ASUS RT-AX57 (AX1800), and set it up as a client that sits under the stairs, and then connect my wired network to that. My question really is, would this work or have I read too much intoo this. Secondly, how easy is it to do? It looks like there's quite a bit of tinkering with the ip addresses and channel settings. 
Many thanks for any tips or advice.

[FLC]

You definitely don't want a second router.

What exactly do you have under the stairs, a network switch, a patch panel, something else?

What Sky service do you have, FTTP or FTTC?

[S_Alexander]

Hi thanks for the reply. Sorry, I'm unaware of what FTTP and FTTC are. My hub is a Sky Max Hub. 

Beneath the stairs I have a network switch with numerous ethernet cables running into it from around the house. Previously this was connected via ethernet cable to my hub. This is now no longer possible, so I was hoping to set a new router up as an Access Point with a seperate SSID, potentially the same SSID if that works, but I read that could cause issues when devices jump from one to another. 
Many thanks

[FLC]

Does you router plug into a telephone socket or a square box with LEDs on it?