Any shortcut keys to insert symbols for ‘Diameter’ and ‘Degrees’ in Sketchup?
Depends on your os and your keyboard.
However I don’t see where you need to input ø and ° in sketchup 
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[Ctrl]+[Shift]+[u]+b0 results in °
[Ctrl]+[Shift]+[u]+f8 results in ø
(but this is on a Chromebook)
You would help us answer your question if you put the right information in your forum profile.
26.0.429 is NOT an operating system. 64-bit is NOT a graphics card.
On Windows on a US keyboard holding Alt while typing 0216 results in Ø and Alt while typing 0176 results in °.
Thank you, Dave, for your feedback. Well appreciated.