Wiress/Battery Switch (possibly even portable)

Hi there,

I am new to HA and after playing around I want to go a step ahead and have multiple actions triggered by one switch. I am renter so I am pretty limited, however I am looking for a button that does not have to be connected to an electric circuit. Currently I have a Hue Brdige.

Options I have found, but don’t seem perfect:
Phillips Hue Switch: I have one, but I dont feel like I want the everywhere in my appartment
Logitech Pop: Don’t seem to work that nice with HA
Xioami Aqara: Little concerned about privacy (is it possible to use them without their Bridge?)

Are there any other solutions? Ideally not too expensive since I would buy quiet a few…

Thanks a lot!