If you have enough time to train, especially during the week, Traditional Base is definitely worth a try to see how you react to that type of training and considering that you are six months away from your actual season.
However TB is not only Z2, take a look at the TR plans and you’ll see that there is a nice progression from Z2, Z2 + Z3 and SS/Threshold in the end.
Also, if you haven’t done that already, give a read to the TB vs SS Thread. There is a lot of information that you can apply to your training even though you may not find exactly your situation.