There is one, it’s called the IPA or International Phonetic Alphabet and is used mostly by linguist. The IPA spelling changes based on dialects within the same language and if you know all the letters and are able to pronounce them you could in theory read a text written in IPA and the listener could understand it.
You can launch steam games from terminal pretty easily.
Browsing can be done with Vimium on Firefox.
Just tackle the times you touch your mouse one issue at a time and you could try putting the mouse in a different room to create a small barrier between you and using it.