Welcome to the family Ime, good to have you here.
You would be best getting yourself an Odysseus for that GGTS as the 2 are made for each other and together they are an awesome combination, you really wont get the full benefit without an Odysseus.
I cant stress this enough Ime, the Ody's will sell out fast and then they go way up in price and you are going to absolutely kick yourself that you didnt get one when you had the chance. You have been incredibly lucky to join the GG family as the spares etc have just gone up for pre sale and when they are gone I mean they are GONE and you will struggle to get anything.
Borrow the money get an Ody and be done with it and if for some reason you dont like it you will get every single penny back that you paid for it and maybe a good bit more, have a look through the classifieds at the prices of second hand Ody's.