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The Monster may be an option but I suspect it’s a bit much while you learn. I think that others reading your posts wonder if you are serious or not. The mention of older cheaper bikes is fair BUT not Fireblades or OWO1s etc. Those bikes may be older but they still do 170+. From memory, a ZZR1100 from 1990 does 72mph in first gear!
There are plenty of bikes to choose from which would be better to learn on and plenty of people here to advise on that - I’m a bit too old to advise now. The main thing about two wheeled motorised transport is that people in four wheeled motorised transport keep trying to kill you. And you must remember a motorbike is not a bicycle - sounds a silly thing to say but the speeds are so much higher, your profile is very similar to a cyclist and car drivers do not appreciate that. Please stay safe.
I may not be being 100% serious about getting a front-rank World Superbike as my first motorcycle.