Oh, I don't talk much about that which I am not to impressed with. I don't say much at all about the Minibrute and mine isn't suffering from any of the physical issues with keys and switches....
I understand you not wanting to goop up the button with sticker glue, but by the same token, you won't ever take the sticker off, so if it's white you won't notice it there after a little bit. I guess I'm not so precious about things like that. I'd probably just black it out with permanent marker if it was annoying me and bypass the sticker.
Oh well, I suggest you don't buy a Beatstep Pro if flashing lights are an issue, though they all stop flashing once stop is hit (but play will flash while paused):
That's in a room with the light off under a loft bed. The step buttons all flash as the cursor passes them and in drum mode the pads flash relative top which pad is being triggered. Oh yeah, there are five Waldorf products in that shot.