I've never heard of a liveaboard company that doesn't have rental gear. You mentioned they provide air. Do they provide weights? I can't help you for renting in that area, but you might consider renting your gear here in the U.S. and take it with you. Renting gear in a foreign country brings up a couple of issues, one being with your gauges. Will they be in bar or pounds? Will your computer be in feet or meters? Even though the computer settings can be changed, oftentimes, the staff does not know how to change it. They just hand them out. I speak from experience years ago before I had my own equipment and rented gear in St. Maarten. Everything was in bar and meters and they couldn't adjust it to U.S. measurements. When I got back home, I bought my own stuff.
If you rent from a land-based shop in Raja and you have a problem out at sea, what next? If the liveaboard doesn't have spare gear or a means for a repair, your dive trip could be over. Others here may have a better answer for you.