If you trigger it, you would exclude every referance to health regeneration.
If you have for example another item that doubles your health regeneration, this wont work.
In the solution I offer, you also can make it percentual... if that is proper english at least
You just make 2 abilities based off a health regen ability (depends on what type of regen you want) and you give them both 10 levels.
level 1 has 0 regen, level 2 has 1 regen, level 3 has 2 regen, etc, etc, etc.
The second ability has the same but then 10 times as much.
Level 1 has 0 regen, level 2 has 10 regen, level 3 has 20 regen, etc, etc, etc.
With this you can fake 100 (0-99) levels while only having 20 levels in total.
Now you only have to set the proper levels once in a while... I think 1 second would be enough.
With this, you could use your 100 levels that you could have wasted into a better system that has 10.000.000.000 fake levels
Can you imagine how strong this is?