Would this 'fix' Grasp of the Undying at all?

Grasp of the Undying

• Upon damaging an enemy champion with an ability or basic attack, remaining in combat for 4 seconds causes your next basic attack against an enemy champion to deal bonus Magic Damage and heals you for the same amount.

Basically, the timer for Grasp doesn't start until you hit an enemy champion with an attack or ability of your own.

There, Immolate no longer passively enables Grasp by just standing in the general vicinity of your enemies. There's still synergy between them, but you have to apply at least a bit more effort than just "stand around and attack sometimes".