overwriting the order property of the belts with "a[transport-belt]-d[express-001-transport-belt]" to "a[transport-belt]-d[express-100-transport-belt]" would make finding desired belts in logistic requests easier.
not a big deal but would be nice

i havent set order for any of them. do they default to sorting alphabetically by internal name?
so the fix is renaming "express-1-transport-belt" to "express-001-transport-belt" etc?

edit: i think thats it done

yes, default sorting order is alphabetically, and the order among the modded belts is now fixed;

however minor issue, the original express-transport-belt is now behind all the modded ones

the easiest fix would be to use order; namely the default order for the express-transport-belt is "a[transport-belt]-c[express-transport-belt]"
the 'c' being the important part
for the modded belts replacing it with a 'd' like this: "a[transport-belt]-d[express-001-transport-belt]"
will ensure that the modded belts will always appear behind the original