
Having had GSDs since 1958 I've had two dogs with soft ears & neither were helped by using artifical aids. Prick eared dogs' ears will go up & down whilst they are teething & IMHE if they are going to go up they will & if they are destined not to than nothing short of surgical intervention will help them.
Plenty of raw bones to chew on will exercise the ear base muscles(one reason one of my dogs had semi soft ears he was never allowed to have anything to chew until I got him aged 10 months)& this in turn will help the ears go up.
I've only ever had one dog(a GSD)who I know had erect ears from birth(I midwifed the litter from my bitch)his ears where laid flat backwards when he was born & as he grew they stayed that way until they were big enough to stand up. It was very odd to see a 3 week old GSD with his ears up !!