The reason you do not find much about them is because it is extremely hard to produce bateaters. It takes a lot of work to get a lock, and even if you do, it can take numerous seasons for the female to become gravid, and even higher stakes of the eggs being viable. Yes it has been done, but it does take a lot of work and time to achieve an outcome.

Retics are more flighty than burms. While burms tend to move slow and pretty much chill while out of their enclosures, retics move a lot more, and faster. All of our retics try to get up in the ceiling when they are out. And while hand taming ( or attempting to ) is almost an essential with large snakes, you occasionally get the one that will retain its attitude, no matter how much you handle it and try to "tame" it.
I have noticed that a few of our retics as soon as you open their cage door, they come flying out at you, but when you rub them with the hook and start to pull them out, they are fine.

Good luck in whatever decision you make, but just know that hybrids are a long process.