Aye thats a good point, I forgot its only temporary. Unless maybe they could force it to awaken? I can't remember if that girl who could de-age others in Film Z, if her powers were "permanent"? I think everyone who was de-aged there was only aged back up when she was defeated?
A counterpart to Shinobus fruit would be perfect, a "rewind" fruit even, something like Eri's quirk in MHA.
Tbh I thought Tokis DF awakening would involve being able to go back in time, to "turn the clock back" too.