Hello Ramiro,
I'm afraid you will have to go on with one device running VTP and the catos devices running GVRP with the need to manually keep their vlan databases in sync.
I've looked at c4000 catos guide 8.4 it talks about VTP version 1,2,3.
There is a distinct chapter for GVRP but interoperability with VTP is not mentioned.
In addition no config chapter about GVRP can be found in IOS config guide also for C6500
Hope to help
Giuseppe