For those on Switch, who don't mind using console commands, you can get a fully imprinted Ryhnio. Spawn one in then use "Setbabyage 0" then unclaimed it then reclaim it "SetImprintQuality 1" and finally "Setbabyage 1". Make sure you are looking at it when you enter the commands and you don't need the " at the beginning and end of the commands.

More Rhyniognatha Everything Else Tips