Same issue I had. If the doorpost/lintel is high enough, you could use a pull up bar like this: https://www.amazon.co.uk/XQ-Max-Door-Gym/dp/B004J0BZ9W
It may seem flimsy, but if your doorframe is sturdy it will hold a lot of weight without shifting. I'm 6'5", weigh 195 lbs and haven't had any issues with it. It's easy to remove and store, too.