That's exactly what I do, but only a few times a week. I tend to place most of my RMAH sales at the weekend (most profit), and make a few transfers to my AH trading account during the week.
I would say the safest safest way would be to put a random rare item on AH with the account you want the gold transfered and buy it with the acc you gold the gold at. You lose 15 % of the gold , but i think its the safest way out there