We can safely expect some export deals for this design. It runs on Diesel - Diesel unlike Ada-Class and affordable. Note the incidents where Ada-Class was not chosen for not being adaptable to Diesel-Diesel.
The secondary mast which carries the TACAN (Tactical air-navigation system) can be easily reconfigured as ESM / COMINT / SIGINT antenna.
Yes it has TACAN even for the base configuration. That enables OPV to conduct helicopter / USV operations in adverse weather conditions or at night.
Main mast supports up to Cenk-S sized Aesa radar, EA / ED systems, PIRI-IRST.
Both AKR Block- A2 spots support AKREP Block-B2.
If people spends sometime to think over embargo claims they would easily conclude the keypoint related to the AIP;
Germany is not bound to support MRO or Refueling station maintenance or technical support related to the AIP, according to the deal, they are only bound to supply AIP for all submarines of the class + refueling station. They can easily embargo the AIP by disabling MRO access and Technical support for refueling station beyond the warranty term, following delivering the subs and will render those submarines less effective than before technically converting Reis class to a Diesel-Electric submarine.
If Germany really desires to embargo this class of submarines, they would easily carry it out directly, without any breach in contract.
Regarding to the Li-Ion on submarines, we have to be quick to jump on the train before it departs. STM500 and other small submarine designs, UUVs, silent convertible - semi-submersible USVs become meaningful with Li-Ion applications. We have to launch certification and rules regarding to the Li-Ion use at sea considering the safety, storage, maintenance etc as soon as possible so that it will be possible to deploy them in 5 years.