Grasp Rework?

Can Grasp of the Undying be reworked so you don't have to be in combat for 4 seconds in order to proc it? Here is what I am suggesting Every second you dont aa, Grasp gains 1 stack, granting .8% max health damage, .4% max health recovery, and 1 max health up to 5 stacks. At max stacks, deal 4% max health damage, heal for 2% of max health, and increase max health by 5. If not out of combat, Grasp procs at max stacks every 4 seconds. You have to hit a champion, of course, in order for it to proc. I don't know how it would for ranged since they might abuse it.