Working happily without any pressure is better than working hurriedly under pressure, even if the salary is high. 
A job is loved when it is done wholeheartedly. If it is not done wholeheartedly, the results will not be optimal.

If I were offered such a position, I would decline it politely. 
First, I would request time to discuss the job wisely with the employer to ensure the best possible outcome. 
My professional principles come first.