My suggestions will swim around, but not constantly. And, of course, I don't have a real good idea of what is available to you. People suggest grammas here, and they are a dime a dozen; I would guess they are a bit more expensive over there.
Anyway, over here ORA is producing captive bred Assessors, and they are great fish that stay small and are peaceful. You likely have more access to wild caught ones than we ever did. I love my yellow assessor. They do like caves, but once at home in your tank, I have found that mine is regularly out and about.
Another fish that I am very fond of and that would work in a small tank is the blue stripe pipefish. I know you can sometimes get captive bred pipes over there, but I don't believe that is one of the species that has been bred. The ones out of Africa are very colorful. They stay quite small and will swim all over, although sometimes they will be out of view because they will be peering into holes in the rock and such.
Another possibility is a citron goby. They are a little bit larger than the coral gobies, and I found that my citron was very personable -- often would perch right on the front glass and actually swam in the water column a lot more than most of my other gobies. He almost never laid on the substrate like your scooters do.
Oh, another possibility, if you are able to get them, would be a Vanderbilt chromis. 2" and very peaceful. I think that they are quite attractive, but they aren't screaming colorful.
There is no way that I would get a diadem dottyback -- they are incredibly aggressive. I'm not sure if an orchid would work in such a small tank or not; the captive bred orchids are suppose to be the most passive of the dottybacks, although I owned a very friendly Springer's that I kept in a tank a bit bigger than yours.
Let us know what you decide to get.