Spelled Little Savior and Ilfan Byrngar's Solace, btw, those shields.
Have you made personal solo Chanter experience on PotD mode with those fights and relying on getting Proned? Or is it purely theoretical talk? I've found the monks at Crägholdt to be quick punchers that do heavy damage while your chant takes time to hurt them and fuel them with wounds to hit you even faster.
When I'm testing characters I usually fart around Cragholdt for a bit but no, I have to admit I don't have much extensive solo experience.
There is also the Black Sanctuary shield that you can use to cast withdraw on yourself and you'll chant while you're invincible, but that's probably more of an exploit that anything else. If you've got a priest a long then this is strategy that can be used (or abused) from level 1.
I have found in my many playthroughs that enemy PC Monks AI seems to be set to zooming towards the lowest deflection characters in range and landing Prone/Disables with any wounds that are available. Drunken Orlan is maybe more of a unique case, as if memory serves he used the Dichotomous Soul quite a lot.