I don't think surviving would be that big of an issue. I think Reimu guides lost humans all the time? I thought I read it in WaHH.
Gensokyo isn't as dangerous as it was in the far past.
I think it would be a lot better than this place. It's not like you're living in the stone ages. There's a lot of technology and knowledge from the Outside World and there's no reason you couldn't build upon it. Not to mention other parties with knowledge like Eiren or the Kappa. You could tinker on computers or go outside in nature.
There's no real danger of catastrophe. No matter what happens in the Outside World it will never touch Gensokyo.
Ironically Gensokyo feels a lot closer to the utopian idea of the fusion of technology and nature 20 years ago around the turn of the millenium.
The only problem is humanity. You would still be mortal and subject to disease and death and the elements. If you wanted to play it safe you would stay trapped in the human village.
I would probably end up throwing away my humanity in the end and become a youkai. Or something inhuman.
Even if it meant murder. I would be selective though. Because the first murder is feels like placing a bond between you and someone else. To have the cause of your freedom be some insect would be nasty.
That said taking the magician route like Alice or Marisa would be a better idea.
To make it this far and be trapped in another cage?
I don't want to stay in the human village and on the assigned paths forever.
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