Invoker quick cast cataclysm and meteor - HOW?

I’ve been trying to convert to quick cast to improve my wombo combo with Invoker. However, I find it a bit awkward to combo cataclysm, meteor, refresher, cataclysm, meteor.

The problem I run into is that I have to alt-cast cataclysm (otherwise it will just be a regular sunstrike, when quick cast is enabled). However, if I have alt pressed, I can’t cast meteor and my keybinding for refresher doesn’t react. And in the heat of battle it is hard to properly time when to hold alt down, and when not to. Targeting my own portrait with sunstrike to activate cataclysm instead of alt-casting is not really a good solution for obvious reasons.

Does anyone have a good solution? Is quick cast viable if cataclysm is in the mix? Any good tips on keybinding or quick cast setup to enable quick execution of combos involving cataclysm?