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superkey-launch
Linux utility to configure modifier keys to act as other keys when pressed and released on their own.
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plasma-hud
Provides a way to run menubar commands in KDE Plasma through rofi, much like the Unity 7 Heads-Up Display (HUD).
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
So you either write some kind of dbus service that calls rofi (shouldn't be too hard) or you can use an alternative daemon like this one https://github.com/ryanpcmcquen/superkey-launch
If you have troubles implementing the dbus method you can take a look to the source code of plasma-hud here. It's a python daemon that creates a dbus service that you can call to show a rofi menu. Theres a lot of stuff going on there, but the important bits are at the end of the script, starting from line 713.