See, I don't agree. I believe that Free-will has power over those who do not have it. And intimately Uriel does not have it.
Further, Harry DID summon him in Changes.
And summoning circles are just for summoning, so if he is Summonable, than that circle(s) would possible do the trick.
Well... Uriel does have free will. He just only has one Choice.
This, to me, sets him apart from other beings who lack Free Will (like possibly Mab, and certainly
nearly everything controlled under Winter Law). Of course Ivy also is partly human, and so locking her in a circle required a whole host of measures to block her Will simply tearing the circle apart... and I rank Uriel more powerful, so it would require a truly imposing effort to even come close to imprisoning him.
In fact, given it took an Archangel to imprison Ivy, who I rank significantly lower on the power totem pole, it wouldn't surprise me if only TWG or the Outer Gods (provided such outsiders exist) could even attempt it - and with TWG, at least, it seems obvious that Falling would have weird interactions with such an attempt.