iATKOS | United Kingdom

I just got my T440 in. Specs: i5-4300u, 8gb ram (dimm only, no soldered ram), 1080p panel (must be an aftermarket, no 1080p from factory), and stock synaptics touchpad. I want to run either Catalina or Big Sur on it. I've searched and searched. All I've found were Sierra guides, and they were for the T440s, not the T440.

Is there a guide to follow specifically for the T440, or is it the basic OpenCore guide? I know wifi is kinda broken, or at least varied (with the stock wifi card), so I plan on using 3rd party card or wifi dongle.