I did more experimenting with LTK. The LoN version seems promising but I'm still missing too many pieces.
In the mean time, I've switched over to the Hand of Ytar rune with SWK. No more need to shift-click and it doesn't trigger the Epiphany teleport, so it's a lot easier to play and maintain stacks. With the 50% attack speed on LTK, your base APS would need to be low - around 1.3 - for that to be self-sustaining via the belt stack regen, but fortunately the crits make up some difference there.
In the mean time, I've switched over to the Hand of Ytar rune with SWK. No more need to shift-click and it doesn't trigger the Epiphany teleport, so it's a lot easier to play and maintain stacks. With the 50% attack speed on LTK, your base APS would need to be low - around 1.3 - for that to be self-sustaining via the belt stack regen, but fortunately the crits make up some difference there.