[Endoperez]

Step2 can be easily done with F1 screen, and won't be needed every turn. Once in a few turns is enough, and I prefer to do that any way with any nation.
Step3: I thought hunt happens before movement and battles. That would mean that if the hunters catch anything, they can summon the imps. This is most often the case, so I don't worry about leaving the hunters any slaves.
Step 4: Only needed in border provinces, really. Although as it is provinces bordering enemy dominion instead of enemy territory, it can sometimes be hard to notice. This is second step that really has to take time when playing Mictlan, and only if you don't have specialized priests that Blood Sacrifice continuously.
Step5: Isn't that much harder than sitesearching without spells, or for holy/unholy magic, so I don't find it particularly infuriating.

All of these do add micromanagement, but I don't think they increase it as much as you think.