There (IMO) has to be a better reason than 'just for grins/curiosity' to go through the expense, etc. of a bar swap. As for 'hitting your thigh' ... wouldn't that depend on YOUR thighs? IOW, how can we possibly know the answer to that? My DW is 5'6" and I have her on 38cm bullhorns. 45cm bullhorn is definitely huge. I have 42cm for my own drop bars which is perfect. My road bike came with 44cm and I keep threatening to put 42 on her. I am 5'10"/200lb. Even 40/42 cm is big for a 5' petite female. But that may be what is needed to clear your hips. Bottom line, if her bars overlap your tush then you have to measure said tush and get bars that can fit around said tush and Stoker has to deal. Bullhorns kind of skirt the issue because they can
run low under your rump and Stoker doesn't have to be so spread out.