In Gold, you are allowed to do the entire routine on the high bar, so as long as you could use a springboard to jump up and grab the high bar, then do a pullover, you could do your entire routine up there.
Of course, the coaches would have to agree to it.
On our team, we have girls who have all their skills except for the squat on do a climb up onto the low bar.
We have one girl that often gets just one foot on. If she feels balanced enough, she will slide the other foot up onto the bar too.
Have you considered a straddle on instead? We have had a couple who had more success with that because they were "all legs" and there wasn't enough space for their feet to be on the bar in between their hands. One of them ended up almost breaking her nose trying to get the squat on ... she did end up with a bloody nose and 2 black eyes from it.