Nope not crazy, some people remove the ac and add a fantastic fan or maxxair in the space. Runs on 12v, less weight and great for boondocking! Would also probaly be cool enough for you in such a small space.
What kind of hole is left? I really worry about getting it sealed up.
I'll have to research fans and such.
There should be an opening that’s 14” x 14” where the ac comes through your roof. You can replace it with a skylight or a fan. It should be a direct fit. Use vulkem to seal and screws to attach new fan or skylight.
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