This app was mentioned in 3 comments, with an average of 1.00 upvote
https://play.google.com/store/apps/details?id=com.steppschuh.remotecontrolcollection
It supports mouse movement and keyboard input, but also has modes for presentation, media keys and one for all the shortcuts (F-keys). Maybe it suits your needs.
there are a couple of good android app to pc using the same google voice-
https://play.google.com/store/apps/details?id=com.steppschuh.remotecontrolcollection&hl=en
is what i use. when you use the keyboard remote you can use the microphone key on the phone keyboard to do voice to pc text.
the same app developer i see has a mouse and keyboard app but i have not tried it yet.
I think there are some remote control programs out there that can do this - if you don't mind shutting down from an android phone, for example, you could use something like this app.