When I cycled my brackish tank at an SG of 1.005 I attempted to kickstart it with media from one of my FW tanks. It didn't work. So in my wisdom I tried adding live sand from the SW tank. Didn't work either. In the end I just used ammonia.
If you are buying fish that are in FW from your LFS then I would cycle the tank as a FW tank (which it looks like you have done) and then after you add the livestock, slowly raise the SG to the desired level over the course of five weeks. Now, the reason I say five weeks is because that is about the standard time for a fishless cycle so it will give the tank time to adjust. Someone who has actually made the FW->BW transition this way may have a different view.
I think a 10g might be a bit small for knight gobies but bumblebees would love it in there. Some rockwork would give them some security and hiding spots.
For a cleaup crew, olive nerite snails would be fine in brackish and do actually need brackish water to reproduce. For plants, I can grow java fern and jungle val at the lower end at around 1.004 but the vals definitely do better as salinity gets higher.
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