Its a bad idea to go from a longer acting drug like Klonopin to a shorter one like Ativan, the likelihood of introducing interdose withdrawal is high. A benzo is a benzo is a benzo, there is no easier, softer way to rid yourself of these drugs. Valium is the gold standard because of its long half life but its no picnic and crossing to another benzo isn't fun, it comes with its own set of challenges and many members end up back on their original drug because they can't deal with the side effects. Unless you have serious interdose withdrawal on the drug you're currently taking, crossing over to a longer acting drug in my opinion isn't worth it and crossing to a shorter acting one is not a good idea.
As for supplementing your Klonopin dose with Ativan, well that's just wrong, using a benzo to withdraw from another benzo makes no sense, how do you then get off the Ativan? Honestly, there needs to be some serious training requirements for doctors when it comes to withdrawing their patients from benzo's!