This has been tried many times in the past and never succeeded. When the BATF became part of the Justice Department it was speculated that the FBI would absorb them and take over their duties. As it turned out The FBI didn't want any of the BATF agents because they were mostly idiots and douche bags.
Truth. BATFE agents are considered rejects by most other federal agencies. They don't want them. Based on the number of times they step on their own cranks, I wouldn't disagree with that assessment.