MBA M4 - External screen HiDPI

[Kogut]

Hi Guys!
Recently I have bought MBA M4.
At work I have 2 1440p 27 monitors.
Over past few days I learnt more or less about MST and HIDPI.
My main monitor is connected via DELL DOCK and the cable is display port.
In Display settings I can choose 2560x1440 resolution but without hidpi and it looks really bad.
By default hidpi is enabled only for somethingx720 so everything is so big and unusable.
With one-key-hidpi I was able to get 2048x1152 resolution with hidpi enabled, text is very crispy and not too large.
Is it the best resolution I can achieve with this configuration and hidpi enabled?
Is the one-key-hidpi best way to enable it?
At home I have LG 34 21:9 3440x1440 but I haven't tried connecting yet because I don't have usb c cable nor hub.
What resolution with hidpi enabled I will be able to get for my LG monitor?
What cable/hub do you recommend guys?
I guess I need HDMI - USB c cable to easily connect my LG at home and hub to connect the second monitor at work.

Thanks for every suggestion!

 

[Kogut]

I know these are quite technical questions, but I am sure that some of you have been through it.
Could I ask for moving this post to macOS section?

Today I tried USB-C - Display port 1.4 8k cable which I bought for my MBP 2019 and sadly it doesn't work with my MBA M4.
It doesn't detect monitor at all.

 

[kk123]

one-key-hidpi is minimalist and great when it works. (it worked for my 21:9 monitor, but not for my 32:9 monitor)
The go-to alternative is https://github.com/waydabber/BetterDisplay

If your DisplayPort cable still works for other laptops, I really don't see why it wouldn't work for M4.