I read a few things that sounds strange to me.
First heavy jetfins in a 3mm wetsuit? Why? Even I can't hold balance then anymore. If I teach people in a wetsuit and they have balance problems and heavy fins, I will give them my lightweighted fins for my wetsuit and then they feel for sure the difference. It are no splitfins, but the Seac F1 (quite long). Or the Scubapro Go Sport (that are techfins for a wetsuit).
Also that you could not do the last dives of a course were you paid for. Fundies is not a tech course were you have to deal with unsafety if people are not good enough. It is a shallow entry level course.
Further, I don't think you won't find buddies to practise with. Also if you just do a fundive, you can practise of course. I had students in my courses with a fail on fundies and with a tech rating and a fail does not say they will not improve later. Also I have failed a student with a tech rating on an normoxic course. We agreed together to quit. It was not a direct fail, but the student did not want to practise. He just wanted to dive for fun. So the balance with 2 stages never came.
The most important thing is that you want to learn. Then you can improve. Even if you will never do a gue course again, the main thing is practise to improve. And remember, most technical divers have done courses with other agencies, they are not worser or better. DIR is a mindset, but it can be found in every agency if you find the right instructor. So do what feels right for you. Maybe you will start sidemount quite fast for example. Some divers dive easier in sidemount. There is no good or bad choice. Just practise, dive dive dive dive. Even a fundive is a practise. So dive dive dive with the equipment you have now. Practise, but still make sure you have fun. And then decide if you want to redo fundies or not. Also remember, the best instructor can be a worse one for you if personalities won't fit. But first: fun fun fun, dive dive dive, practise, practise, practise. And don't look down to a padi or cmas diver that also wants to practise with you. They also can overlook you when doing a valvedrill, they also can shoot an smb, can also practise finkicks. Every minute under water is also practising. Internet can be a help to find specific buddies, I see it quite often that someone wants to practise for fundies.