How about this;
Let men over 35 yrs old, who want to ski 36mph, stay in Men 2 as long as they want.
Women over 53 who want to ski 34mph, stay in Women 4.
Similar for Men 7&8, and Women 8&9.
For the Boys and Girls who want to stay at lower speeds, Have separate divisions; Boys 3-34, Boys 3-36. Similar for the Girls.
In the interest of fairness, and rankings that mean anything, we simply can't have different speeds in the same division.
Don Aschenbrenner