As he is already being monitored by the Isreal U21 team (as evident by him being nominated) you will be sure to get advice from their Manager.
You have a very valuable player on your hands who, if you are willing to, would be able to train for a long time. If you want to indeed turn him into a SF I would consider training his Forward skills first, as his height would be better suited for guard training, so you want to get the other one "out of the way" first before age gradually begins slowing his training.