Trump has used fake names/personalities before, most commonly John. Some people suspect Q is Trump. What does that give us? John Q. John Q was a movie played by Denzel WASHINGTON, where JOHN Q takes over a hospital in order to make shit right. In the movie, John's the good guy but everyone thinks he's a maniac. By the end of the movie though, even the corrupt cops who wanted Johns son to die because he was black learned to understand his plight, and the day was saved.
I think Q is a long-time servant in some intelligence agency. He's much more steeped in geopolitics than Trump could be. Trump has been busy with his multiple businesses. Trump isn't ignorant of geopolitical affairs. To me he doesn't come off as someone who knows as much as Q does in all those various areas.
The twos' personas are different too. It's better if Q is someone else other than Trump. He has access to people and systems agents might try to distract Trump from.