How is this an issue, just have in class tests and exams, writing, multiple choices etc. It would end up giving lower weights to slower and more thoughtful writers.
A take home exam or an essay is not less stress. It just expands the time boundaries of the stressor. The intensity of the stress doesn't ever get as high as an in-class exam perhaps. But the total stress was, in our lived experience, much greater.
I definitely found take home less stressful. Back in those days I was very much not a morning person. With take home I could take the test at a time of day when I was at peak alertness which often occurred at around midnight. For most tests there were several days between when the test was handed out and when it was due, so I could order the tests so that I could take the ones I needed more preparation for at the end of finals week.
With in class tests they might occur when I'm less alert, and they might schedule the subjects I need the most prep time for early in the week and the ones I don't need prep for late in the week.
If the teacher evaluates the right things Chatgpt isn't a problem but just an optional tool.