If it has 4 outputs then it's probably just a normal quad LNB, not unicable.
Unless you run more cables, from the LNB, to other tuners, on your receiver, you are stuck with viewing channels on the same transponder, during a recording, unless you fit a terrestrial tuner, USB, or internal, and connect a cable from your roof aerial.
If you now have your dish fixed, on 28.2E, check which channels, you view/record the most, are on the same transponder. and then put these in it's own bouquet, (favourites), folder.
Code:
https://www.lyngsat.com/Astra-2E-2F-2G.html