A Caesar 1/72 goblin might be a starting point.
I recently got a 3d printed not-Grogu with my order from Perikles.be
It’s a 3d printer service that sells very good prints. The Grogu would also be small enough for 20mm and you could mod him with your magnificent green stuff skills.
Into what, you ask?
Well to stay tru to your setting, a race of wizards fighting oppression would ring a bell with the Jews. But you already have them and it’s impossible to model a specific kid.
That’s why I would make him a little demon child, something like Hellboy...with horns maybe. That way the inquisition would have a reason to get him.
And, thank you, yes. This is the way!