I have not heard of that. Cheetah conversions are viable because the airframe is essentially identical to the Tiger. The Traveler has a smaller elevator, so I don't know if it can provide the necessary pitch control authority with the extra weight up front.
That being said, and with all due respect to my POA colleagues, this is the wrong place to ask. Get ye to the Grumman Gang, Grumman Pilots Association, Grumman Owner & Pilots Association, or one of several Grumman-specific Facebook groups as soon as possible for a more knowledgeable answer.
To answer what you really want to know though, I can't imagine a conversion would be cheaper than just buying a Tiger to begin with. That's what I did.