First of all, the Rafale project was shown off to fully replace the whole fleets of the french airfoce only. I mean, not prepared for any exportation at the first time of the project.
France was an original pioneer member of the Eurofighter Typhoon program. They pulled out of the Typhoon program so that they can develop the Rafale. Till date, less than 100 Rafale have been built with no export orders yet. In contrast, more than 260 of the newer Typhoons have been built with 620 confirmed orders from the participating countries alone. Typhoon, despite being a later arrival as compared to Rafale, has also secured export orders Austria, Saudi Arabia and Greece. Guess who is having the last laugh?
Back to the topic, I wonder if Taiwan can be associated with Japan in a gen 5 aircraft project. By then, they better face a too powerful militarized China, darkening the overall Asia.
Taiwan-Japan collaboration? And which political party in Taiwan will have the will to make it happen? KMT is currently pro-China, so certainly not them. DPP didn't do anything close to that when they were in power for 8 years. Perhaps an independent President?
Other than US, the only other realistic source of military hardware for RoC will be the Russians. At least they can also offer a full suite of options ranging from fighters (MIGs, SUs), warships, subs (kilos will be nice), tanks (T-90s perhaps?) and missiles (BrahMos, S-300, etc).