I recently started to play a crafting mmorpg (bitcraft) and while it runs great on the steam deck, the controls are not great. I have been playing with an old dell usb keyboard and Bluetooth trackball. I would like to find a great Bluetooth keyboard. So many of the wireless keyboards I have looked at require a dongle, which limits my ability to charge unless I use a dock.
I would rather a larger keyboard than a smaller one.
I have the k480 which I like for typing and such, but for gaming I find it too small. It looks to be similar to your 380 but the 480 has a slot to hold a tablet or phone.
I do like hearing the 380 has a case though.
I was looking at the Logitech mx keys s, but it is $130. At that point I would probably go with a gaming keyboard.