OkThis is why one will need to have a good reason to change a form.
Lian Bu Quan was created as the 1st beginner level training form for The Central Guoshu Institute back in 1928. Since the whole form didn't even have one back reverse punch, GM Han Ching-Tang changed a double palms strike into a back reverse punch (at 0.43 in the following clip). So change had been done by my long fist teacher's teacher.
My long fist teacher's Lian Bu Chuan.
My long fist brother's Lian Bu Chuan.