Apologies for the ambiguous heading - couldn’t think of a good title.

My current setup is as follows: FTTH, Ethernet throughout some of the house (rental, can’t change this). I have the router in the upstairs lounge room.

Two computers are in an adjacent room. 1 computer is on wifi (5Ghz) provided by the motherboard, this is my main gaming pc. The second computer is a DIY NAS connected to a TV. This is connected to a 4 port switch. The switch has a USB wifi dongle (2.4Ghz only). The main PC also has Ethernet running to the switch so I can transfer media from it to the NAS.

Windows doesn’t seem to like having two active connections (WIFI & Ethernet) active at once, and instead preferences the Ethernet. The WAN connectivity provided by the 2.4Ghz dongle via the switch is fine for the NAS (light YouTube, some media scraping) but not suitable for the gaming PC (40Mbit max, ping fluctuations etc).

Is there a way to have a more elegant setup of this? Running Ethernet from the router to the switch isn’t an option (wife will murder me) and rental, so can’t go running more CAT through the walls).

Thanks in advance.