I am the same, I miss my macaroni cheese pre s w days. I only like the well............ macaroni and cheese sauce, nothing else in it so thats a bit of a no no unless I do one on a green day, but the cheese sauce is still a bit difficult.
For a cheap, easy sauce use ASDA smart price macaroni cheese 395g it's only 3 syns for the whole tin. I liquidize it and use as a sauce, you can also add 1Hea portion of strong cheddar cheese, very nice!
I have used the Smart price Macaroni cheese, I thought it was 5.5 Syns, my cons says it's a tweak so I tried, cooking cauliflower then mashing it, add cottage cheese with chives, 3eggs, blitz all together with 1 tsp paprika, 1 tsp, mustard powder, 1/2 tsp cayenne pepper, was really nice