Hi Sven,
First of all, in HANA it's also better rething the need of procedure and loops in favor of mass access and set operations. In my experience it may appears a bit dificult on the beggining but tremendously beneficial later.
It's automatic put in parallel if READS SQL DATA and no imperative logic used.
Using exec also made it works sequentially.
One option you can explore is Script Calculation View, but you have the problem of input tables which is not possible on CV, because this I used the term explore. Maybe you can do part dynamic and part static with high performance.
Regards, Fernando Da Rós