Rolling Compounding DoT?

[Hateborne]

Sorry to bother everyone but ..well, here goes.

I am trying to see if a rolling, compouding DoT is possible. In a nutshell, in order to match another class, I suggested a DoT that stacks up based on a few variables (essentially every form of DD Lifetap would add 30% of said DD's damage to the DoT's total damage and reset duration to 18 sec).

Is this possible without MASSIVE recoding or will I have to come up with C++ resolution to make it a reality?

I will clarify anything if necessary, so please point out any missing/invalid points.

Thank you,
-Hate