Friesians aren’t exactly known for their ammy friendly temperament, and almost every one I have met and worked with was an absolute terror in their first years of life. Not spooky, but way too smart and if you give an inch they will take a mile.
(For instance, at a place I worked at they had a 3 year old. I was always fair but stern with her, and because of that she respected me and we never had a problem. But she didn’t respect the woman’s son, and if she ever felt that he was too slow or too stupid, she would kick him right in the behind. She also would steal his hat, bite him, etc. That man ended up with a lot of bruises)
So, my point is that basically all friesians act like little shits when they are young, so you are starting off trying to find a unicorn personality in a relatively obscure breed. Throw in your other wants and that makes for a very difficult order.
I think that if you won’t consider other breeds, you will need to save up for longer so you can afford one that’s at least 6 years old and started under saddle to get what you want.