How can a Jew convert to Hinduism?
There is no proper provision for conversion in Hinduism except some like ISKCON which is more like organization. However, the practices like Yoga, Meditation which are regarded as very important in spiritual path can be practiced by anybody. So, we can say you don't have to call yourself Hindu to be Hindu, you can simply follow the core path and add the changes according to time to make compatible -thats what Buddha & Mahabir did.
You can go through this answer, Pradip Gangopadhyay's answer to How one can convert from Islam to Hindu?.