You’re right; their depiction in the poem is positive. It sounds like they’re not really meant to reflect the real world at all; is that correct? If that’s the case, I’ll still be willing to do this if we make it clear they’re their own thing. I don’t know about the situation in your country and I’m sorry for projecting my own political context there, but I admit I still wouldn’t be comfortable basing them on a real police force even if it isn’t the US’s.
If you’d rather withdraw, that’s perfectly within your right. I don’t want to make any changes to your work you don’t want. And we can always switch to the second place option, Beauty and the Beast.