I can find posts from 2019 still repeating the same information, but since people always seem to find the thread I started in 2018 wondering about these devices (the community was a lot smaller back then and I apparently happened to be the first person who was curious about them), I've updated my first post in that thread to indicate that this information is still, as of the time of my update, accurate: most of the Ikea remote/button devices won't work (the Symfonisk Remote does, and people have had luck with the similar plain round "wireless dimmer" but not the 5-button "steering device" you have), and lots of their bulbs are questionable, too. 
Hopefully this will help people searching in the future. Thanks for putting the idea in my head!
