From what I understand (and what we did yesterday) you don't have to gradually decrease salinity. Going in reverse, to increase salinity later - yes you have to take it slow.
We put a Banggai, Hi Fin banded goby & a Green Clown goby into 1.010 yesterday after a drip acclimation only. Everyone's fine this morning.
My hiding spot is only a little more effort than yours. I raided the recycle bin for a plastic jar (vitamins or something) & cut it in half vertically. TWO hiding spots.