I don’t use thread because it has no memory like wire. With wire you can bend and position it so it drapes like real engine wires. With thread it just springs like cat whiskers.
There are plenty of options in the hobby. Several aftermarket companies sell wire, some thinner than others. Other companies sell prewired distributors, which makes it one step easier for a few bucks.
I have used electronics wires too. Some guys will buy a roll of the correct wire, for a lifestyle supply. I would want to see a sample before I buy since wire is sold by the copper wire size and plastic insulation covering can vary in thickness, which is what gives you the appearance that will either make or break your model.
I’ve had a few damaged cell phone charging cables that have yielded wire that was acceptable.