I've also looked at growing grapes so I can larp as an ancient Roman or Greek and make home made wine. So far I don't have any direct experience since I'm a rentcel and not a landchad, but I've done a lot of reading and research.
The vines will take 3-5 years to start to produce viable fruit. I'm not sure how transplanting an older vine would effect this time line but I'd image the plant would need to regrow it's roots into the new soil. Additionally, I'd image the tiles you have and foundation will get fucked as the roots grow and expand, so keep that in mind. Another factor is your wall isn't allowing the sun total access to the plants. Again, my experience is just reading and researching about how to grow grapes, but based on it I'd say your situation isn't ideal. Also you will need more plants if you want to make a bottle of wine.