First a disclaimer - I was known for builds at the 20 cap. That's a long time ago and I do not know much about theorycrafting any more. So assume you are talking to an inexperienced player, not a former build designer.
The Warlock nerf has come and gone and that class is still pretty strong.
It got me thinking. Spiritual Retribution offers a lot to a fast attacking melee (aka a monk). Spirit Blast, Eldritch Burst and Eldritch Aura provide considerable point blank AoE damage, useful to a monk.
The ridiculous tankiness provided by Shining Through, Brilliance and the prereqs for Spiritual Retribution also can only help a monk.
Is there a strong synergy here?
I'm looking to get a Monk past life and am open to either doing it as a 1-20 or a 15-30. I'd probably mostly be running Reaper 1-4 (1 in unknown groups, 2 in reasonable PUGs, and 3 or 4 with people I know) dropping to easier settings near 30, and it doesn't need to perform beyond that.