Well, I just found a guide on how to install twrp 3.2.3 on a Samsung Galaxy Star here, which has the model number SM-J337T. It has the exact same SoC, CPU and GPU as my device. The guide has a link to an unnoficial twrp recovery.img image. Would it be safe for me to use that for my SM-J337W?
PS. What does the T and W mean in the device model number?