At the very least I did so on pc through the browser console, nothing fancy, just standard stats.(variable)=(new value), although you can change the variable perk_num to 0 to give you space for three more perks and when you are done you can set flaw_num=3 to not have to take any flaw. In android I just use an app I found that doesn't work too well, I will try out this Kiwi browser that you are talking about.