You didn’t say what country you are in (the ZRCS 90 is available in multiple regions) and the devices available do vary somewhat, but there are a number of choices, both handheld and wall mount.
See the buttons and remotes FAQ. You should be able to find something there:
You can also check the FAQ on switches to use with smart bulbs, although it sounds like you already know most of the issues that covers. 
However, it might give you a few additional ideas: