I don't have any safety concerns about the T67. There is a group owned one at Redhill with the 160 hp Lycoming, I've flown it a couple of times and our club uses it for aerobatic experience flights and instruction. As G says above I think it's a dog with a bad name as a result of some inexperienced users. However I am no aerobat and I've only used it for IMC instruction.
But what do I know about dangerous aeroplanes ? I've flown a few PA-38s without coming to any harm.
If the OP wants to try it out and talk to an experienced aerobatic instructor, let me know and I can PM the details.