I don't know if this seems possible. I am sure what you said about psychedelics could be true such as the out of the box thinking. But I don't see how something like enhanced creativity could happen without the animals already being capable of creativity. There seems to be some sort of leap. How to you go from something that isn't creative to something that is or something with no morals to something with morals.
Very true the organism needs to already be sufficiently advanced to process every thing. I'd say rather than a mental evolution it would be a closer to a reprogramming. Reallocation of mental resources into these creative methods of organization and application.